Step Edit - MPC putting event at 04:01:00 before 01:01:00

Sometimes when I do changes in Step Edit, the MPC puts an event, that would be later (let's say at 04:01:00) before an event that would be sooner (lets say at 01:01:00). as soon as the MPC in playback reaches that point, it stops making noises.

This occurs often and it's pretty difficult to find the error in a complex mix. Weird is that it always occurs in tracks I ain't changing atm.

And I don't have no idea, what I'm doing wrong.

Can someone riddle this out for me?

which os? sounds like the os 2.01 MOVE note bug, where sequence data is broken when you move a note

I have OS 2.12. It's the latest on the page of AKAI.

I just moved around some notes, but the sequence didn't get broke this time. Maybe it's some random bug or something.