The Comment is empty but there is info on the MP3 file

[ohrenkino]

You could check whether you have APE tags in the files and how you treat them.
Here is a thread about invisible comments and APE tags:

mp3tag Can't Remove APE2 Tags?

Hi guys, Checking out some mp3's I have and they have APE2 embedded in them. When I check the preferences for mp3tag there is an option to wrote APEv2 but there isn't an option to remove APEv2 any work around or reason for this? thanks! [:book:]