Social and Meta Options being overridden

Hi,

I've set Social and Meta options for one of my blog posts (Image, Author, Description, Title), but every time I share to Facebook, the Author is replaced by the meta:author in the code, and the image is replaced by a seemingly random image from the homepage of the site (same image every time) - any ideas?

I've attached my diagnostics report, just in case you ask for it.

Perch: 2.8.31
Production mode: Production (100)
Installed apps: content (2.8.31), assets (2.8.31), categories (2.8.31), perch_shop_paypal (1.2.3), perch_forms (1.8.3), perch_blog (5.0), perch_comments (1.2), perch_members (1.5), perch_twitter (3.5.1)
DB driver: PDO
DB tables: perch2_blog_authors (5), perch2_blog_comments (2), perch2_blog_index (512), perch2_blog_posts (11), perch2_blog_posts_to_tags (22), perch2_blog_sections (1), perch2_blog_tags (14), perch2_blogs (1), perch2_categories (1), perch2_category_counts (0), perch2_category_sets (3), perch2_comments (10), perch2_comments_votes (0), perch2_content_index (4269), perch2_content_items (1228), perch2_content_regions (324), perch2_courses (1), perch2_forms (2), perch2_forms_responses (14), perch2_members (0), perch2_members_forms (1), perch2_members_member_tags (0), perch2_members_sessions (1), perch2_members_tags (0), perch2_navigation (4), perch2_navigation_pages (45), perch2_page_templates (21), perch2_pages (78), perch2_resource_log (4005), perch2_resource_tags (6), perch2_resources (788), perch2_resources_to_tags (6), perch2_settings (37), perch2_shop_categories (11), perch2_shop_courses (4), perch2_shop_log (4), perch2_shop_orders (3), perch2_shop_product_options (0), perch2_shop_products (4), perch2_shop_products_to_categories (0), perch2_shop_products_to_courses (0), perch2_twitter_scheduled_tweets (0), perch2_twitter_settings (1), perch2_twitter_tweets (956), perch2_user_passwords (0), perch2_user_privileges (81), perch2_user_role_privileges (16), perch2_user_roles (2), perch2_users (9)
Users: 9
App runtimes:
<?php
    $apps_list = array(
        'content', 
        'categories',
        'perch_blog',
        'perch_members',
        'perch_twitter',
        'perch_forms',
        'perch_comments',
        'perch_shop_paypal'
    );
Scheduled tasks for perch_blog: delete_spam_comments (1440 mins)
Scheduled tasks for perch_comments: delete_spam_comments (1440 mins)
Scheduled tasks for perch_twitter: post_tweets (1 mins), update_tweets (30 mins)
Editor plug-ins: markitup
H1: ef3923fbeb3bbfc5c7d69e48b72db948
L1: decc131a5977ddd7a8d783c56351db03
F1: 2edba60ed1f613d6dd804feb202456a2
headerColour: #ffffff
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 0
content_collapseList: 1
lang: en-gb
update_2.8.25: done
latest_version: 2.8.15
on_sale_version: 2.8.31
headerScheme: light
perch_blog_site_name:
perch_blog_post_url: /news/post.php?s={postSlug}
perch_blog_slug_format: {postTitle}-{postID}
perch_blog_akismet_key:
perch_blog_max_spam_days: 0
dashboard: 0
hide_pwd_reset: 0
content_hideNonEditableRegions: 1
content_frontend_edit: 0
perch_blog_comment_notify: 1
perch_blog_update: 5.0.1
perch_members_update: 1.4
perch_twitter_update: 3.5
perch_members_login_page: /members/login.php?r={returnURL}
update_2.8.31: done
perch_shop_update: 1.0.6
perch_comments_akismet_key:
perch_comments_max_spam_days: 0
perch_shop_price_tax_mode: exc
perch_shop_site_url: https://
perch_shop_product_url: /training-and-courses/product.php?s={productSlug}
perch_shop_default_currency:
perch_shop_reporting_currency:
perch_shop_invoice_number_format: Invoice%d
perch_shop_display_oos: 1
perch_shop_paypal_email: info@activegloucestershire.org
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_DB_USERNAME: activeglos_live
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: admin_activeglos_live
PERCH_DB_PREFIX: perch2_
PERCH_TZ: UTC
PERCH_EMAIL_FROM: info@activegloucestershire.org
PERCH_EMAIL_FROM_NAME: Active Gloucestershire
PERCH_LOGINPATH: /cms
PERCH_PATH: /var/www/vhosts/activegloucestershire.org/httpdocs/cms
PERCH_CORE: /var/www/vhosts/activegloucestershire.org/httpdocs/cms/core
PERCH_RESFILEPATH: /var/www/vhosts/activegloucestershire.org/httpdocs/cms/resources
PERCH_RESPATH: /cms/resources
PERCH_HTML5: 1
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_RUNWAY_ROUTED:
PERCH_STRONG_PASSWORDS:
PERCH_DEBUG:
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /var/www/vhosts/activegloucestershire.org/httpdocs/cms/templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_PRODUCTION_MODE: 100
PERCH_RWD:
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_STRIPSLASHES:
PERCH_PROGRESSIVE_FLUSH: 1
PERCH_PARANOID:
PERCH_FORCE_SECURE_COOKIES:
PERCH_PASSWORD_MIN_LENGTH: 6
PERCH_MAX_FAILED_LOGINS: 10
PERCH_AUTH_LOCKOUT_DURATION: 1 HOUR
PERCH_VERIFY_UPLOADS:
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: 5.4.13
Zend: 2.4.0
OS: Linux
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: 5.5.30
MySQL server: 5.5.30
Free disk space: 3.83 GB
Extensions: Core, date, ereg, libxml, openssl, pcre, zlib, bz2, calendar, ctype, hash, filter, ftp, gettext, gmp, SPL, iconv, pcntl, readline, Reflection, session, standard, shmop, SimpleXML, sockets, mbstring, tokenizer, xml, cgi-fcgi, curl, dom, fileinfo, gd, imagick, imap, json, ldap, exif, mcrypt, mysql, mysqli, odbc, PDO, pdo_mysql, PDO_ODBC, pdo_sqlite, Phar, snmp, sqlite3, wddx, xmlreader, xmlrpc, xmlwriter, xsl, zip, mhash, ionCube Loader
GD: Yes
ImageMagick: Yes
PHP max upload size: 128M
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
PATH: /sbin:/usr/sbin:/bin:/usr/bin
PP_CUSTOM_PHP_INI: /var/www/vhosts/system/activegloucestershire.org/etc/php.ini
PP_CUSTOM_PHP_CGI_INDEX: fastcgi
SCRIPT_NAME: /cms/core/settings/diagnostics/index.php
REQUEST_URI: /cms/core/settings/diagnostics/?extended
QUERY_STRING: extended
REQUEST_METHOD: GET
SERVER_PROTOCOL: HTTP/1.0
GATEWAY_INTERFACE: CGI/1.1
REMOTE_PORT: 60963
SCRIPT_FILENAME: /var/www/vhosts/activegloucestershire.org/httpdocs/cms/core/settings/diagnostics/index.php
SERVER_ADMIN: jamesh@thirdfloordesign.co.uk
DOCUMENT_ROOT: /var/www/vhosts/activegloucestershire.org/httpdocs
REMOTE_ADDR: 82.35.54.156
SERVER_PORT: 80
SERVER_ADDR: 205.186.165.244
SERVER_NAME: www.activegloucestershire.org
SERVER_SOFTWARE: Apache
SERVER_SIGNATURE: <address>Apache Server at www.activegloucestershire.org Port 80</address>
HTTP_COOKIE: __utma=1.28334944.1465223411.1465223411.1465223411.1; __utmz=1.1465223411.1.1.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided); __utma=1.28334944.1465223411.1465223411.1465223411.1; __utmz=1.1465223411.1.1.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided); _ga=GA1.2.28334944.1465223411; cmsa=1; __atuvc=2%7C31%2C1%7C32%2C11%7C33%2C0%7C34%2C2%7C35; __atuvs=57c824c4dd89b9ad001; PHPSESSID=hkmvb3925r3jic9u7uv1h88na0
HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.8
HTTP_ACCEPT_ENCODING: gzip, deflate, sdch
HTTP_REFERER: https://www.activegloucestershire.org/cms/core/settings/diagnostics/
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_CONNECTION: close
HTTP_X_ACCEL_INTERNAL: /internal-nginx-static-location
HTTP_X_FORWARDED_FOR: 82.35.54.156
HTTP_X_REAL_IP: 82.35.54.156
HTTP_HOST: www.activegloucestershire.org
UNIQUE_ID: V8gmh826pfQAADhlJs4AAAAC
FCGI_ROLE: RESPONDER
PHP_SELF: /cms/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1472734855.1347
REQUEST_TIME: 1472734855

Thanks!