MIDI notes moving by theyselves

I record a MIDI drum track “live” with a keyboard, and then fix the timing for some (rare) notes not in the tempo (it’s a cover from a live track, so no Quantize possible and I set “glue” on “no grid”…). Have listen closely and several times, everything was fine.

Then I save/close the session and when re-start it next day, some of the notes are not in rythm but am not sure at all that it is the ones I moved.

Did I missed something in preferences or else, or could it be a bug?