What is the on the back of this ASM 300? 0

[newavengers1]

Hey guys. New member here so hopefully I do this right! I just picked up this copy of ASM300 and am generally pretty happy with it. I did however notice what looks like additional white space/paper on the last page/back cover and was curious as to just what exactly this is? I'm guessing a printing error where they didn't cut squarely on the back? 

Please see pics for reference and thanks in advance!

[Mercury Man]

What's the cover look like?   Is it 'square'?

[newavengers1]

Cover looks normal to me. No additional white space/paper. Only on the back. Just looks like it wasn't cut squarely during the printing process.

[Kevin76]

Didn't go straight through the trimmer. That black line is where it's supposed to be cut.