I'm curious to know whether the well itself has this problem, just straight out of the box before it's even used to encapsulate a comic or is this defect introduced during the process (possibly be slight hand pressure at in the middle, back of the well holding the well during the sealing process)?
Has anyone addressed this at all in the discussion?
No idea whether this is right or not, but it would explain why the defect is quite prominent on many books graded recently. If someone new is doing the sealing, perhaps this person is inadvertently causing the problem in this way. Sheer speculation, of course.
When I asked, I was told it came in that way. So it is from the manufacturer.