The way that you’ve created the square in your graphics program, it’s seeing it as having an inside and outside. So it’s cutting along both edges. Check that you don’t have a stroke or border on it.
Maybe this will help:
Also some people have reported that making sure that if they have a router that’s both 2.4 and 5ghz, that making sure that their computer and SM are both connecting to the 2.4 sometimes helps.
Restarting router sometimes helps too.
You’re supposed to go and adjust the captured square in the camera image and make them line up. Personally I find camera capture pointless (btw, it only works over wi-fi due to technical/hardware limitations.) It falls apart as soon as there is any thickness to the materials. There are better and faster and more accurate ways to determine work origin on material.
If you’ve had success cutting and now having problems, try blowing off your lens with some canned air. You can try cleaning it too with some lens paper and lens fluid but I try to do that as little as possible.
-S