revisited a song i produced as a backing track ages ago to put down a vocal. song was a BIAB file i opened and saved in RB. after a couple of tries took the tempo down from 95 to 90 bpm and dropped a key from A to G.

audio is still fine but the chords and bars are now adrift - lagging behind the audio

any idea why? not a problem as i'm going to lay down the vocal 'by ear' as it were and i don't need to regenerate or add tracks so part markers, bars and chord changes are no longer needed