Line Weight Issue for Portfolio

Good evening y'all and happy holidays!

I have a problem I've been trying to figure out these past few days and no sources online seem to solve the exact issue I'm facing. Basically as the title says my line weights are all varying on different sources and the two most important ones (the Issuu and print version) are reading them incredibly dark for some reason and despite me messing with preferences and printing options it keeps coming out darker than the preferred illustrator weight.

I could just make this page a screenshot and put it on but whenever I compress the file of my portfolio it makes the quality go down drastically for images so I'm trying to avoid that as much as possible.

I'm also not entirely sure if I should take this to another sub, but I thought since this is an architecture issue at heart that maybe someone else has had trouble with. Regardless, if anyone has any advice it would be greatly appreciated since this has been a pressing issue for a fat minute