App dropdown on mobile bug

When viewing the dashboard on a mobile screen, the Apps dropdown menu appears behind other elements on the page making it hard to click navigation items on the app menu. This seems to occur once you've scrolled down the page, and scrolled up, and not on initial page load. Looks like a z-index issue.

Diagnostic:

Perch: 2.8.13
Production mode: Development (10)
Installed apps: content (2.8.13), assets (2.8.13), categories (2.8.13), slkt_40acts (1.0), perch_blog (4.6), ojl_events (1.0), perch_forms (1.7), perch_mailchimp (2.0.1), ojl_talks (1.0), perch_twitter (3.1)
DB driver: PDO
DB tables: perch2_40acts_posts, perch2_40acts_subscribers, perch2_blog_authors, perch2_blog_categories, perch2_blog_comments, perch2_blog_index, perch2_blog_posts, perch2_blog_posts_to_categories, perch2_blog_posts_to_tags, perch2_blog_sections, perch2_blog_tags, perch2_categories, perch2_category_counts, perch2_category_sets, perch2_content_index, perch2_content_items, perch2_content_regions, perch2_events, perch2_events_categories, perch2_events_to_categories, perch2_forms, perch2_forms_responses, perch2_gallery_albums, perch2_gallery_image_versions, perch2_gallery_images, perch2_mailchimp_campaigns, perch2_mailchimp_history, perch2_mailchimp_log, perch2_mailchimp_stats, perch2_mailchimp_subscribers, perch2_navigation, perch2_navigation_pages, perch2_ojl_events, perch2_ojl_events_categories, perch2_ojl_events_recurring, perch2_ojl_events_recurring_to_categories, perch2_ojl_events_to_categories, perch2_ojl_search_log, perch2_ojl_talks, perch2_ojl_talks_passages, perch2_ojl_talks_series, perch2_ojl_talks_speakers, perch2_ojl_talks_stats, perch2_ojl_talks_tags, perch2_ojl_talks_to_tags, perch2_page_templates, perch2_pages, perch2_podcasts, perch2_podcasts_downloads, perch2_podcasts_episodes, perch2_resource_log, perch2_resource_tags, perch2_resources, perch2_resources_to_tags, perch2_scheduled_tasks, perch2_settings, perch2_twitter_settings, perch2_twitter_tweets, 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_blog/runtime.php');
    include(PERCH_PATH.'/addons/apps/perch_twitter/runtime.php');
    include(PERCH_PATH.'/addons/apps/perch_forms/runtime.php');
    include(PERCH_PATH.'/addons/apps/perch_mailchimp/runtime.php');

    include(PERCH_PATH.'/addons/apps/ojl_talks/runtime.php');
    include(PERCH_PATH.'/addons/apps/ojl_events/runtime.php');
    include(PERCH_PATH.'/addons/apps/slkt_hidden_contact/runtime.php');
    include(PERCH_PATH.'/addons/apps/slkt_40acts/runtime.php');

?>
Scheduled tasks for perch_blog: delete_spam_comments (1440 mins)
Scheduled tasks for perch_mailchimp: update_list_stats (60 mins)
Scheduled tasks for perch_twitter: update_tweets (30 mins)
Editor plug-ins: markitup, redactor
H1: 7692d2d4ef9fd8ea1704ca70d667cdb6
L1: c8b027601149fec285c5d70fd18b6ae9
headerColour: #ffffff
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 1
content_collapseList: 1
lang: en-gb
update_2.3: done
latest_version: 2.8.8
headerScheme: light
dashboard: 1
content_hideNonEditableRegions: 1
logoPath: /system/resources/1380045575_logo-small.png
ojl_talks_talk_url: /talks/{talkSlug}
ojl_events_detail_url: /whats-on/events/{eventSlug}
ojl_talks_bucket: talks
ojl_talks_max_spam_days: 0
perch_blog_post_url: /news/{postSlug}
perch_blog_update: 5.0
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key:
perch_blog_max_spam_days: 0
perch_blog_comment_notify: 0
perch_gallery_update: 2.7
ojl_talks_abs_apikey: i9PZZRn7M0JgPQyTLOpW6ZCbli4ZcSdle7lAsXy0
perch_gallery_bucket_mode: single
perch_gallery_bucket: default
perch_gallery_basicUpload: 0
update_2.3.2: done
ojl_events_admin_per_page: 20
perch_events_update: 1.8
update_2.3.4: done
perch_mailchimp_secret: 16218035fb51e218dd432f3803c0beba
perch_mailchimp_update: 2.0
perch_mailchimp_api_key: 649799f613d007fbb11e4e8cf49121d4-us2
perch_mailchimp_list_id: e716cd68cf
perch_mailchimp_campaign_url: /newsletter/campaigns/{campaignSlug}
on_sale_version: 2.8.13
ojl_talks_bible_translation: eng-ESV
ojl_talks_update: 1.2
update_2.4: done
perch_backup_mysqldump_path: /Applications/MAMP/Library/bin/mysqldump
content_frontend_edit: 1
update_2.4.1: done
update_2.4.3: done
update_2.4.4: done
slkt_40acts_unsubscribe_url: /40acts/unsubscribe/{unsubscribeToken}
update_2.4.9: done
update_2.5.1: done
update_2.5.4: done
update_2.6.6: done
hide_pwd_reset: 0
update_2.7.4: done
update_2.7.9: done
update_2.7.10: done
update_2.8.6: done
update_2.8.11: done
update_2.8.13: done
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_TZ: Europe/London
PERCH_EMAIL_FROM: webmaster@slkt.org.uk
PERCH_EMAIL_FROM_NAME: St Luke's Oseney Crescent
PERCH_LOGINPATH: /system
PERCH_PATH: /[***]/public/system
PERCH_CORE: /[***]/public/system/core
PERCH_RESFILEPATH: /[***]/public/system/resources
PERCH_RESPATH: /system/resources
PERCH_RWD: 1
PERCH_HTML5: 1
PERCH_SCHEDULE_SECRET: salmonella
PERCH_PRODUCTION_MODE: 10
PERCH_DEBUG: 1
PERCH_DB_USERNAME: root
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: slkt-v2
PERCH_DB_PREFIX: perch2_
PERCH_RUNWAY:
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_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /[***]/public/system/templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_STRIPSLASHES:
PERCH_PROGRESSIVE_FLUSH: 1
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
PERCH_SESSION_TIMEOUT_MINS: 20
PERCH_APPS_EDITOR_PLUGIN: markitup
PERCH_APPS_EDITOR_MARKUP_LANGUAGE: textile
HOSTING SETTINGS

PHP: 5.6.10
Zend: 2.6.0
OS: Darwin
SAPI: apache2handler
Safe mode: not detected
MySQL client: mysqlnd 5.0.11-dev - 20120503 - $Id: 3c688b6bbc30d36af3ac34fdd4b7b5b787fe5555 $
MySQL server: 5.5.42
Extensions: Core, date, ereg, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2, calendar, ctype, curl, dom, hash, fileinfo, filter, ftp, gd, SPL, iconv, intl, json, ldap, mbstring, session, standard, mysqlnd, mysqli, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, mysql, SimpleXML, soap, sockets, exif, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, apache2handler, imap, yaz, mcrypt, gettext, pgsql, pdo_pgsql
GD: Yes
ImageMagick: No
PHP max upload size: 32M
PHP max form post size: 32M
PHP memory limit: 128M
Total max uploadable file size: 32M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: Yes
HTTP_HOST: slkt.dev
HTTP_CONNECTION: keep-alive
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36
HTTP_DNT: 1
HTTP_REFERER: https://slkt.dev/system/core/settings/diagnostics/
HTTP_ACCEPT_ENCODING: gzip, deflate, sdch
HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.8,fr;q=0.6
HTTP_COOKIE: __atuvc=1%7C34; cmsa=1; PHPSESSID=83b5275487c744334a1b1db20efb3f22
PATH: /usr/bin:/bin:/usr/sbin:/sbin
SERVER_SOFTWARE: Apache/2.2.29 (Unix) mod_wsgi/3.5 Python/2.7.10 PHP/5.6.10 mod_ssl/2.2.29 OpenSSL/0.9.8zg DAV/2 mod_fastcgi/2.4.6 mod_perl/2.0.9 Perl/v5.22.0
SERVER_NAME: slkt.dev
SERVER_ADDR: ::1
SERVER_PORT: 80
REMOTE_ADDR: ::1
DOCUMENT_ROOT: /[***]/public
SERVER_ADMIN: mrtriangle@gmail.com
SCRIPT_FILENAME: /[***]/public/system/core/settings/diagnostics/index.php
REMOTE_PORT: 50552
GATEWAY_INTERFACE: CGI/1.1
SERVER_PROTOCOL: HTTP/1.1
REQUEST_METHOD: GET
QUERY_STRING: extended
REQUEST_URI: /system/core/settings/diagnostics/?extended
SCRIPT_NAME: /system/core/settings/diagnostics/index.php
PHP_SELF: /system/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1440943246.33
REQUEST_TIME: 1440943246
argc: 1