Thank you both Peter and Bob, turns out it was the bleed and slug that was set to .125, and I agree, working with this print house in particular has been a bit of a headache. But I'm stuck as this is who my company chooses to use. I've never worked with a print house that is so high maintenance. Usually I can just send my file with a description of what I want, and the job is taken care of.
Thanks again for your responses, helped me a ton!
Best,
Corinna