It is a mis-cut card, PSA designations be d*mned. It is not even a diamond cut card, it is a hexagonal cut card since there are clearly 6 sides, or at least 6 (reasonably) straight edges. If a card that is supposed to have 4 sides actually has 6, how can it
not be 'mis-cut"?
If I were you and you are happy with the card, keep it. If you aren't happy with the card, find someone who bows to the PSA gods and sell it to them as a PSA graded 8.
