MusicBrainz track numbers look weird

Before when I imported tags from MusicBrainz, the track numbers would look like X/[Total Tracks]. So if an album had 4 tracks, you'd see 1/4, 2/4, 3/4, 4/4.
Now, however, I see them listed like this:
1, 1/
2/
3/
4/

Has something changed within MusicBrainz or is there something within Mp3tag that goes wrong here?

Just update your Mp3tag to the newest beta version.
Since v3.29c the newest necessary changes for MusicBrainz are included.

Ah yes that fixed it! I just downloaded v3.29 but didn't know there was another version. Thank you!