Apologies that you are having difficulty, can I just ask you a few questions:
1. Has this just started to happen?
2. Does this happen when playing a particular puzzle or size of puzzle or is it all puzzles?
3. Are you using the magnet feature? - if so perhaps try to do a puzzle without it and see if it makes a difference
4. Are you using the segment locking feature? - if so perhaps try to go to your settings and turn it off and see if that makes a difference