Same design cut one after another comes out different Atomstack A5 pro

I’m new to laser cutting and tried cutting and engraving on plywood - the first cut came out perfect but then I tried to cut the same thing twice, but both came out wrong. Is this due to the laser getting stuck whilst moving or what might be the issue? Had a similar issue when engraving a photo, where it was fine, but then halfway up the image the laser made a line and cut some of the image of (as if it was stuck). I’ve checked that it moves when I move it by hand but maybe I need to adjust something. I have three layers - one is the image engraving, one is the outer cut line and then a small circe cut at the top.