Gi wheel! There are several topics on this matter, let point some:
Crafter Notes | Need a Hand with Calibration? These Tips Might Help
LOKLIK Icraft - print & cut issues? tips?
Important! Try this:
You can search for more, as there are many.
It is more or less always the same. I’m sure @rinsky has a saved layout to answer this 
Updated software and firmware
A good calibration
Proper printed calibration marks
Good lighting conditions avoiding both lack of light and reflections
Adding little items in the sheet to perform test in the same material you’re using.ñ
If you tell us details or show us the particular sheet that is failing, we can go with you until you get to do it. The factors are common, though. And once you get it, it’s never a issue anymore.