I have this sometimes:
If a song has lyrics, it shows correctly
If next song doesn’t have a Lyrics track, last loaded Lyrics track is remaining showed on iOS app (regardless it’s not that song anymore).
If stepping again to a song with Lyrics track, it gets back to sync (even if Lyrics track is empty, iOS app/Lyrics gets back to sync)
I don’t know if you can reproduce this, I meight send a video about a few mounths ago, but that time I didn’t narroved this only happens me when doing steps above. If team can’t see, can’t reproduce, feel free to let me know, I will take a short video with the computer and iOS device next to each other.
Felician