u/GertrudeStan28

Hi so im trying to make a book and when i export the pdf in signatures these weird octagons appear at the edges? They are not there in the original pdf, so the hell? Any help?

https://preview.redd.it/2q3jx1zr4yyg1.png?width=1908&format=png&auto=webp&s=f5f130d01f6fc2749fb10642bdda98ceeb2b85be