Your artistic ability is quite obvious. You are going to rock that laser!
I had the same issue with the lid. I would bet $ that level is your problem. Experimenting with moving the unit this way or that a few inches, or shimming under one corner or side should correct that condition. If the table it sits on has leveling feet work with those.
Those fingerprints are just the first ones. They make it clear to me why my wife was dead set against a glass top dinette table! I keep glass cleaner and paper towels next to the glowforge.
I have discovered that this community is as big an asset as the laser for the talent and experience gathered here.
Enjoy the adventure, and please continue to share your excellent work with us!