iTunes syncs lyrics every time

Support
1

I have been using MP3Tag for a long time on 20k .mp3 files under Windows 10.

I use MediaHuman Lyrics Finder because it is fast and can handle 20k files at once. Lyrics are placed in UNSYNCEDLYRICS successfully preceded by XXX|| which I understand is a language prefix where XXX = unknown.

I use iTunes to sync all music to my iPhone, and every time after syncing the songs, it syncs EVERY lyric. I don't know if this is caused by a tag I am unaware of, or the fact that the tag is called Unsynched Lyrics.

Has anyone encountered this problem with iTunes and overcome it?

Thanks

2

Who / what is "it" in this context?
If you suspect a special field to cause the problems, then a screenshot of the extended tags dialogue of a file before you synchronize it with the iPhone and a screenshot after you have synchronized (played?) it could help in the analysis.