Can you tell if the lid is closed all the way? Have you moved it at all where it might not be level? I know I had a problem with my bottom door not closed all the way which was causing some issues with the picture from the lid camera.
That’s perfectly normal and every forge has it…or at least the majority - if someone doesn’t have it they should consider themselves lucky. It doesn’t change anything, and once you select your material and focus it generally goes away.
The fisheye lens of the is extreme. What you’re getting is a guesstimate at flat/square. Once you put in focus it’ll re-guesstimate for that spot. It’s pretty intense maths
My little circle comes and goes depending on how well the front door and lid are seated. The good news is. it doesn’t cause the alignment to be off. Alignment is dependent on having the exact material height so it can do the calculations to flatten the fish-eye image you can see in @deirdrebeth comment. I know that’s proofgrade material, but have you tried using set focus before aligning your artwork? If not, I’d give that a test and see if it helps. If it’s still off, it might be something support will have to look into further.