Since that is not normal behavior nor a common complaint, we need more information.

https://makemusic.zendesk.com/hc/en-us/community/posts/215729367-General-Discussion-House-Rules 

You should probably post a couple of screen shots, too. Let us know if you need help with that.

Do you mean that the TAB changes its appearance during playback? Does it revert to correct after playback is complete? If that’s the case, it’s been noticed in other docs, where notes or lyrics jump around, but only during the playback.

And AFAIK, a cause (or cure) has not been found.