No problem here as long as I don’t loop the selection with chopper here and keep the chopping speed constant.
As soon as I loop a part it shifts the startingpoint.
Also when I automate the speed it shifts the startingpoint when I compare it to a recorded duplicate of automated part.
I don’t know if this is expected behaviour though because chopper does not restart on every bar or new note like you can do with for instance a lfo on a midicontrolled device (exactly the reason why I should not use it).
Maybe include your system specs in your sig, that makes support easier.
Not instantly refer to “bug” might help also, far to many people on the forum do that without any confirmation from other users.