I was attempting to add a release, and the release editor started acting very wonky, thinking that two tracks had the same track number, reordering arrows jumping the track to unexpected positions, reset/track parser doing weird things, stuff like that.

Attached is the json tracklist data, and a screenshot of the state when this happened.

URL: http://beta.musicbrainz.org/release/add?release-group=1a405fb8-65bd-33bd-a24d-80e7adfe40f3
Approximate sequence of events:

Add new release, copy existing 10-track release, so release editor started with 10 tracks from an existing release; added 4 tracks, deleted one from the middle somewhere, added one to the end...started renumbering them with the editable track numbers, remembered that I should be using the arrows...moved some around with the arrows, which is where I think the numbering started getting really weird.

...went into the track parser, hit save, found that a track (3) was missing completely, went to the edit note page to see that it was still there... after that it was mostly trying things to fix it:

• expanding/collapsing the medium
• reset track numbers
• track parser
  None of those methods worked.

I hope there's enough information here to find the problem.