I first noticed this when the front door is open (on this pre-release it is really stiff to open) the front edge of the lid would rub slightly on the left. Close the door and lid clearance was restored.
Since I had originally placed the machine, the left edge of the lid glass top had been about 1/8" raised from fully closed. I just placed a little weight on it.
Recently while troubleshooting the ventilation problem I was having, I moved the glowforge across the room to my steel welding table. I immediately noticed the lid was rubbing. I cleaned out the fan grill in back and moved the machine back to that slide out shelf it lives on. I re-positioned it maybe an inch from where it had been before, and not only was the lid not rubbing - but the lid shut completely.
The glowforge case is nice and rigid, but because of its size and weight a slight deviation in the supporting surface can telegraph into the form, and therefore the fit of the lid.
If the lid on your glowforge exhibits one side of the lid not seated completely, I would suggest you explore and see if moving it slightly or shimming a corner fixes that.
(BTW, the aluminum from a coke can makes excellent shim material. Scissors cut it like paper and you can stack it to achieve the required thickness.)
During furniture installation for customers, I would put a new dinning chair down on the floor and it would rock slightly. The customer would immediately assume the chair was defective. I would re position it and it wouldn’t rock, demonstrating that the floor was not glass-flat.
Point of that is your cart or table may telegraph a deviation of the floor its sitting on to the top your glowforge sits on.
Edit; Not a problem with the machine, a problem with gravity. Welcome to earth.