Strange List Saving Issue

I'm trying to edit this specific list:

http://www.giantbomb.com/profile/elektrixx/lists/my-100-greatest-games-of-all-time-updated-25-02-20/15978

I can change the title fine, but when I swap #3 and #2 around it gives the saving popup, says list completed at the top and then loads this page!

http://www.giantbomb.com/ravine/3035-1277/forums/the-default-image-on-this-page-needs-to-be-changed-15978/

When I return to the list, no changes have been saved. I've edited other lists since the site launch with no issues (except it still says I have 14 unread messages when I really don't).

Windows 8 Pro

Chrome 25.0.1364.97 m (in desktop mode)

[edit] Maybe it's related to the "15978" at the end of the links.