Problem with cloth physics

I’ve been making a low poly ship in blender, and have been having trouble with the cloth physics on the sails. The first sail I made works perfectly, but the other two, (which have the exact same cloth settings as the first) don’t work at all. I’ve tried deleting the bakes and re-baking everything. Unfortunately, as a new user here i can’t upload attachments so i can’t give you the blend file, but if anyone has an idea what could be wrong, that would be great.

You can upload here and share the link:
http://pasteall.org/blend/