Canon 7010VP heating issue or 100# coated book issue

Hello,
I'm new to this forum so please excuse any amateur mistakes. I had a job on a Canon 7010VP that a form on an offset press was short. 100# Malibu gloss was used. Job printed fine. Bindery showed that the paper easily tore at the fold (saddle stitch job) and ripped apart after it was printed on the Canon. The bindery had no problem folding the offset forms. Is the Canon cooking the paper so that it easily rips apart? Any ideas? Thank you in advance.