Question

So many times when quantising, some notes get moved to the “left” bar even though their beginning is closer to the right.
This results in two notes getting placed on top of each other etc...

Answer 1

This is probably an obvious answer, but are you sure you are quantising at the correct resolution for what you want to achieve?. ie, if you quantise 16th notes using a single note resolution, then all the 16th notes will end up on top of each other. M

Answer 2

I know what I’m doing, been doing this ever since Cakewalk pro audio 9 ;)