Lulu.com keeps screwing up the printing size of my books...

You request a normal size comic, a regular issue, and they mail you something 5 times too large. It fucking sucks! I've self-published 5 comics with this website, and every time they screw the print sizing up. I should really just contact them directly, but seriously Lulu.com. Get your shit together. STOP MISPRINTING MY SHIT!!!! Fuck this pisses me off. They've shat all over my publishing career.