Thanks for writing. It sounds as though your passionflower is infected with a disease --- but without being able to examine it in person, I really can't say what disease it is.
For more help, I'd take a sample of the affected leaves to the folks at your county's cooperative extension office --- the staff there should be able to help more if they can actually see what's going on.
Sorry I can't help more, but this free service really isn't suited to diagnosing plant problems like this because we need to actually see the plant.
---Justin, Senior Garden Editor, BHG.com