how i have the shield
View: https://imgur.com/a/hNcqCNm
gap on the bottom
View: https://imgur.com/a/ViJ6oHW
View: https://imgur.com/a/hNcqCNm
gap on the bottom
View: https://imgur.com/a/ViJ6oHW
You can see where the motherboard compares to the edge of the case, a gap at the bottom left but no gap top left, etc.
You can also take a look at the standoffs in the case, make sure they are all tight and correctly placed, then make sure the motherboard is lined up with them right.
Align it with the standoffs and tighten it down, then do a mock install of your GPU, see how well it would fit.
if it works, ignore the I/O.
If it dosent, your case could be bent.