Why does the cover variant sometimes appear off center? 1 1

[Lady Death Footstool]

I have been seeing un-centered variant notations pretty often online for mostly signature series books.  Why does this happen? It is an incredible eyesore and is always the first thing I notice when I look at a slab has this.  Please don't tell me this is intentional and would qualify for an ME.  This example is not my book but makes me scared for the 25 odd signature books I have pending from SDCC.

[MattM CS]

Hello @Lady Death Footstool,

I know you mentioned this was not your book. Could you please include the certification number in your image so I can review this with our graders? 

[Lady Death Footstool]

Messaged you the original image.