Content disappears when reordering block

Hi,

I have come across a strange issue when reordering a block. The content seems to dissapear - https://quick.as/kV3WIOoYz

This is a custom ckeditor, but was experiencing the same issue with other regions.

Any ideas why this might be happening?

Perch Runway: 2.8.19
Production mode: Production (100)
Installed apps: content (2.8.19), assets (2.8.19), categories (2.8.19), perch_blog (5.0), collection_1 (2.8.19), perch_mailchimp (2.0.1), perch_twitter (3.5.1)
DB driver: PDO
DB tables: perch2_backup_plans, perch2_backup_resources, perch2_backup_runs, perch2_blog_authors, perch2_blog_comments, perch2_blog_index, perch2_blog_posts, perch2_blog_posts_to_tags, perch2_blog_sections, perch2_blog_tags, perch2_blogs, perch2_categories, perch2_category_counts, perch2_category_sets, perch2_collection_index, perch2_collection_items, perch2_collection_revisions, perch2_collections, perch2_content_index, perch2_content_items, perch2_content_regions, perch2_mailchimp_campaigns, perch2_mailchimp_history, perch2_mailchimp_log, perch2_mailchimp_stats, perch2_mailchimp_subscribers, perch2_navigation, perch2_navigation_pages, perch2_page_routes, perch2_page_templates, perch2_pages, perch2_resource_log, perch2_resource_tags, perch2_resources, perch2_resources_to_tags, perch2_settings, perch2_twitter_scheduled_tweets, perch2_twitter_settings, perch2_twitter_tweets, perch2_user_privileges, perch2_user_role_privileges, perch2_user_roles, perch2_users
Users: 4
App runtimes:
<?php
    $apps_list = array(
        'content', 
        'categories',
        'perch_blog',
        'perch_mailchimp',
        'perch_twitter',
    );
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: post_tweets (1 mins), update_tweets (1440 mins)
Editor plug-ins: ckeditor, markitup
H1: b8437403a79e4c5ea7beffbc204fad2c
L1: 7d3ec7b8f4126c86d2e4cf20ea478c39
headerColour: #000000
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 0
content_collapseList: 1
lang: en-gb
update_2.8.15: done
perch_blog_update: 5.0.1
headerScheme: dark
update_runway_2.8.15: done
latest_version: 2.8.15
on_sale_version: 2.8.19
dashboard: 0
hide_pwd_reset: 0
content_hideNonEditableRegions: 0
content_frontend_edit: 0
perch_blog_post_url: /resources/blog/{postSlug}
perch_blog_site_name:
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key:
perch_blog_max_spam_days: 0
perch_blog_comment_notify: 0
perch_mailchimp_secret: bb0b25ae91c991f161d07329c998a71f
perch_mailchimp_update: 2.0
perch_mailchimp_api_key:
perch_mailchimp_list_id:
perch_mailchimp_campaign_url: /mailchimp/campaign.php?s={campaignSlug}
perch_twitter_update: 3.5
update_runway_2.8.19: done
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_SITEPATH: /home/iconwww/public_html
PERCH_SCHEDULE_SECRET: xgZbP6h2kWrJb5tZ
PERCH_DB_USERNAME: iconwww_perch
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: iconwww_perch
PERCH_DB_PREFIX: perch2_
PERCH_EMAIL_FROM: finbar.mulholland@themegroup.co.uk
PERCH_EMAIL_FROM_NAME: Finbar Mulholland
PERCH_LOGINPATH: /perch
PERCH_PATH: /home/iconwww/public_html/perch
PERCH_CORE: /home/iconwww/public_html/perch/core
PERCH_RESFILEPATH: /home/iconwww/public_html/perch/resources
PERCH_RESPATH: /perch/resources
PERCH_HTML5: 1
PERCH_TZ: UTC
PERCH_RUNWAY: 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_RUNWAY_ROUTED:
PERCH_DEBUG:
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /home/iconwww/public_html/perch/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_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: 5.5.16
Zend: 2.5.0
OS: Linux
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: mysqlnd 5.0.11-dev - 20120503 - $Id: bf9ad53b11c9a57efdb1057292d73b928b8c5c77 $
MySQL server: 5.5.46-cll
Extensions: Core, date, ereg, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2, calendar, ctype, curl, dom, filter, ftp, gd, hash, iconv, SPL, json, mbstring, mcrypt, session, mysql, mysqli, standard, Phar, posix, Reflection, mysqlnd, SimpleXML, sockets, imap, tokenizer, xml, xmlreader, xmlwriter, cgi-fcgi, PDO, pdo_sqlite, timezonedb, pdo_mysql
GD: Yes
ImageMagick: No
PHP max upload size: 16M
PHP max form post size: 16M
PHP memory limit: 256M
Total max uploadable file size: 16M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: No
DOCUMENT_ROOT: /home/iconwww/public_html
GATEWAY_INTERFACE: CGI/1.1
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
HTTP_CONNECTION: keep-alive
HTTP_COOKIE: _ga=GA1.3.1892533947.1441142352; WRUID=769601459.180823728; __CT_Data=gpv=46&apv_6486_www09=46&cpv_6486_www09=18; ju_sid=%7B01E7C049-5D78-47B3-AD26-8A1093C98116%7D; ju_data_all=N4IgbglgzhAuUgFwEYAMAaEBXKBTATgBYQAmuSGIADgIYDmuAxgPZYB2sSyALJlFbg4xY5RNwDsAJmR9cgrpkF16uEgpDMAZpoJQA+nnmIA2qACSAESQhuyaZJCYSnFADZxyAKwBfALqYtHXx9JRU1E3MrRBs7O0cQZy53Lz9MRhoAW1xNfGYM6wB3IoA6OmZmOgAbXGKWYqwAawB6eM0IYNgsfErCkthCXCy6XKwqWuZ6hvj+6C6e6KKC4v7B3GHWMbrG+Pwsav0MmlhGAfDTEEsuZABmW8pEtw8ffxBcAA9YZkZ8kxfGDmsOzWgLSsAAniCQAAvCBUQHeIAAA%3D; __utma=158794751.1892533947.1441142352.1449762006.1450344912.25; __utmc=158794751; __utmz=158794751.1449577789.23.9.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided); cmsa=1; PHPSESSID=c6cf70242c46c8ba9c552826c1cb8166
HTTP_HOST: icon.themegroup.co.uk
HTTP_REFERER: https://icon.themegroup.co.uk/perch/core/settings/diagnostics/
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/47.0.2526.80 Safari/537.36
PATH: /bin:/usr/bin
QUERY_STRING: extended
REDIRECT_STATUS: 200
REMOTE_ADDR: 213.120.122.155
REMOTE_PORT: 57670
REQUEST_METHOD: GET
REQUEST_URI: /perch/core/settings/diagnostics/?extended
SCRIPT_FILENAME: /home/iconwww/public_html/perch/core/settings/diagnostics/index.php
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php
SERVER_ADDR: 78.31.107.237
SERVER_ADMIN: webmaster@icon.themegroup.co.uk
SERVER_NAME: icon.themegroup.co.uk
SERVER_PORT: 80
SERVER_PROTOCOL: HTTP/1.1
SERVER_SOFTWARE: Apache
PHP_SELF: /perch/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1450437413.93
REQUEST_TIME: 1450437413
argc: 1