Strange problem keeps happening with Gallery App

See here: https://bbms.org.uk/gallery/album.php?s=sports-day-2014

The 7th pic is missing but there is a <li> in place?

Same here for the 6th pic: https://bbms.org.uk/gallery/album.php?s=insanity-has-started

It just happens randomly and there is no way of removing the picture from the backend as it doesn't exist!?

Any ideas guys?

Diagnostics below:

PERCH INFORMATION

Perch: 2.4.9
Production mode: Production (100)
Installed apps: content (2.4.9), perch_gallery (2.8.2), perch_events (1.7)
DB driver: PDO
DB tables: perch2_blog_authors, perch2_blog_categories, perch2_blog_comments, perch2_blog_posts, perch2_blog_posts_to_categories, perch2_blog_posts_to_tags, perch2_blog_tags, perch2_content_index, perch2_content_items, perch2_content_regions, perch2_content_resources, perch2_events, perch2_events_categories, perch2_events_to_categories, perch2_gallery_albums, perch2_gallery_image_versions, perch2_gallery_images, perch2_navigation, perch2_navigation_pages, perch2_page_templates, perch2_pages, perch2_resources, perch2_settings, perch2_user_privileges, perch2_user_role_privileges, perch2_user_roles, perch2_users
Users: 3
App runtimes:
<?php
    include(PERCH_PATH.'/core/apps/content/runtime.php');
    include(PERCH_PATH.'/addons/apps/perch_events/runtime.php');
    include(PERCH_PATH.'/addons/apps/perch_gallery/runtime.php');
//  include(PERCH_PATH.'/addons/apps/perch_blog/runtime.php');
?>
Editor plug-ins: ckeditor, markitup, tinymce
H1: 728d813d04c7e976e335e1fccfd4a757
L1: 5f03fe98b3af6cd6b458a5d86a37e50a
headerColour: #ffffff
content_singlePageEdit: 0
helpURL:
siteURL: /
hideBranding: 1
content_collapseList: 1
lang: en-gb
latest_version: 2.3.2
headerScheme: light
dashboard: 0
content_hideNonEditableRegions: 0
logoPath: /manager/resources/1354702332_WEBSOL.png
perch_events_detail_url: /calendar/event.php?event={eventSlug}
perch_gallery_basicUpload: 0
perch_blog_post_url: /news/post.php?s={postSlug}
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key: 165f33cf4afd
perch_blog_comment_notify: 1
update_2.1.2: done
update_2.2.3: done
perch_gallery_update: 2.7
update_2.2.7: done
update_2.2.11: done
on_sale_version: 2.4.9
update_2.4.5: done
update_2.4.9: done
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_DB_USERNAME: bbms
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: bbms
PERCH_DB_PREFIX: perch2_
PERCH_EMAIL_FROM: steven@web-solutions-ni.com
PERCH_EMAIL_FROM_NAME: Steven Legge
PERCH_LOGINPATH: /manager
PERCH_PATH: C:\Inetpub\vhosts\bbms.org.uk\httpdocs\manager
PERCH_CORE: C:\Inetpub\vhosts\bbms.org.uk\httpdocs\manager\core
PERCH_RESFILEPATH: C:\Inetpub\vhosts\bbms.org.uk\httpdocs\manager\resources
PERCH_RESPATH: /manager/resources
PERCH_HTML5: 1
PERCH_ERROR_MODE: DIE
PERCH_DATE_LONG: %d %B %Y
PERCH_DATE_SHORT: %d %b %Y
PERCH_TIME_SHORT: %H:%M
PERCH_TIME_LONG: %H:%M:%S
PERCH_DEBUG:
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: C:\Inetpub\vhosts\bbms.org.uk\httpdocs\manager\templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_PRODUCTION_MODE: 100
PERCH_RWD:
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
HOSTING SETTINGS

PHP: 5.2.17
Zend: 2.2.0
OS: WINNT
SAPI: cgi-fcgi
Safe mode: detected
MySQL client: 5.0.51a
MySQL server: 5.1.68-community
Extensions: bcmath, calendar, com_dotnet, ctype, date, filter, ftp, hash, iconv, json, odbc, pcre, Reflection, session, libxml, standard, tokenizer, zlib, SimpleXML, dom, SPL, wddx, xml, xmlreader, xmlwriter, cgi-fcgi, curl, gd, gettext, imap, mbstring, mssql, mysql, mysqli, openssl, PDO, pdo_mysql, pdo_sqlite, sockets, SQLite, xsl, zip, ionCube Loader
GD: Yes
ImageMagick: No
PHP max upload size: 10M
PHP max form post size: 8M
PHP memory limit: 128M
Total max uploadable file size: 8M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: No
_FCGI_X_PIPE_: \\.\pipe\IISFCGI-ce68c109-5e50-4f2d-9918-698303942b8e
ACTIVEPERL_CONFIG_DISABLE: 1
ALLUSERSPROFILE: C:\ProgramData
APPDATA: C:\WINDOWS\system32\config\systemprofile\AppData\Roaming
APP_POOL_CONFIG: C:\inetpub\temp\apppools\plesk(default)(2.0)(pool)\plesk(default)(2.0)(pool).config
APP_POOL_ID: plesk(default)(2.0)(pool)
CommonProgramFiles: C:\Program Files (x86)\Common Files
CommonProgramFiles(x86): C:\Program Files (x86)\Common Files
CommonProgramW6432: C:\Program Files\Common Files
COMPUTERNAME: DS9349
ComSpec: C:\WINDOWS\system32\cmd.exe
FP_NO_HOST_CHECK: NO
LOCALAPPDATA: C:\WINDOWS\system32\config\systemprofile\AppData\Local
MAILENABLE_PATH: C:\PROGRA~2\PARALL~1\Plesk\MAILSE~1\MAILEN~1
NUMBER_OF_PROCESSORS: 8
OS: Windows_NT
Path: C:\PROGRA~2\PARALL~1\Plesk\ADDITI~1\Perl\site\bin;C:\PROGRA~2\PARALL~1\Plesk\ADDITI~1\Perl\bin;C:\Program Files (x86)\Parallels\Plesk\Mail Servers\Mail Enable\BIN;C:\Program Files (x86)\Parallels\Plesk\Additional\Python\Scripts;C:\Program Files (x86)\Parallels\Plesk\Additional\Python\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Parallels\Plesk\Mail Servers\Mail Enable\BIN64;c:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\WINDOWS\system32\config\systemprofile\AppData\Roaming\Python\Scripts
PATHEXT: .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.py;.pyw
plesk_bin: C:\Program Files (x86)\Parallels\Plesk\admin\bin
plesk_cli: C:\Program Files (x86)\Parallels\Plesk\bin
plesk_dir: C:\Program Files (x86)\Parallels\Plesk\
plesk_vhosts: C:\Inetpub\vhosts\
PROCESSOR_ARCHITECTURE: x86
PROCESSOR_ARCHITEW6432: AMD64
PROCESSOR_IDENTIFIER: Intel64 Family 6 Model 58 Stepping 9, GenuineIntel
PROCESSOR_LEVEL: 6
PROCESSOR_REVISION: 3a09
ProgramData: C:\ProgramData
ProgramFiles: C:\Program Files (x86)
ProgramFiles(x86): C:\Program Files (x86)
ProgramW6432: C:\Program Files
PSModulePath: C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules\
PUBLIC: C:\Users\Public
SystemDrive: C:
SystemRoot: C:\WINDOWS
TEMP: C:\WINDOWS\TEMP
TMP: C:\WINDOWS\TEMP
UATDATA: C:\Windows\SysWOW64\CCM\UATData\D9F8C395-CAB8-491d-B8AC-179A1FE1BE77
USERDOMAIN: WG9349
USERNAME: DS9349$
USERPROFILE: C:\WINDOWS\system32\config\systemprofile
windir: C:\WINDOWS
windows_tracing_flags: 3
windows_tracing_logfile: C:\BVTBin\Tests\installpackage\csilogfile.log
FCGI_ROLE: RESPONDER
HTTP_CONNECTION: keep-alive
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
HTTP_ACCEPT_ENCODING: gzip,deflate,sdch
HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.8,fr;q=0.6
HTTP_COOKIE: __utma=104467539.1466271117.1395928315.1402994239.1403595834.9; __utmb=104467539.1.10.1403595834; __utmc=104467539; __utmz=104467539.1395928315.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); PHPSESSID=a82de92cd4f31919a98d679b3b0dfc98; cmsa=1
HTTP_HOST: bbms.org.uk
HTTP_REFERER: https://bbms.org.uk/manager/core/settings/
HTTP_USER_AGENT: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36
IIS_UrlRewriteModule: 7.1.0761.0
APPL_MD_PATH: /LM/W3SVC/23/ROOT
APPL_PHYSICAL_PATH: C:\Inetpub\vhosts\bbms.org.uk\httpdocs\
DOCUMENT_ROOT: C:\Inetpub\vhosts\bbms.org.uk\httpdocs
GATEWAY_INTERFACE: CGI/1.1
HTTPS: off
INSTANCE_ID: 23
INSTANCE_NAME: BBMS.ORG.UK
INSTANCE_META_PATH: /LM/W3SVC/23
LOCAL_ADDR: 94.136.50.152
PATH_TRANSLATED: C:\Inetpub\vhosts\bbms.org.uk\httpdocs\manager\core\settings\diagnostics\Index.php
REMOTE_ADDR: 81.140.37.211
REMOTE_HOST: 81.140.37.211
REMOTE_PORT: 63357
REQUEST_METHOD: GET
REQUEST_URI: /manager/core/settings/diagnostics/
SCRIPT_FILENAME: C:\Inetpub\vhosts\bbms.org.uk\httpdocs\manager\core\settings\diagnostics\Index.php
SCRIPT_NAME: /manager/core/settings/diagnostics/Index.php
SERVER_NAME: bbms.org.uk
SERVER_PORT: 80
SERVER_PROTOCOL: HTTP/1.1
SERVER_SOFTWARE: Microsoft-IIS/7.5
URL: /manager/core/settings/diagnostics/Index.php
ORIG_PATH_INFO: /manager/core/settings/diagnostics/Index.php
PHP_SELF: /manager/core/settings/diagnostics/Index.php
REQUEST_TIME: 1403596487