Music memos bass notes are not being saved

so i've been creating lots of songs with this fantastic app however i noticed something quite odd.

so after i recorded my idea i rewrote the chords this is because the app not always recognize the chords correctly.

that being said i transferred my idea to Garage Band and everything sounded as i expected but when i went back to the music memos to try and tweak the chords for bass a little i noticed that once im done tweaking bass notes on each section i tap done and all notes are gone like it did not saved the changes now i've been using the app with iOS 10 betas and never had issues however i just installed the 3rd beta.

iOS 10 Beta 3 iPhone 6s