It could be Cucumber mosaic virus. Take a look at this link, which describes Passiflora leaf diseases and shows images of the diseased leaves to help with i.d.

Here is a link that might be useful: Passiflora diseases

It really reminds me of what I saw in my previous P. membranacea plant (when I was living in a different location). I was assured by several people that the problem was chlorosis, and that's just what it looked like in that species. Both P. membranacea and P. lutea are Decalobas, so closely related. It's reasonable to think that the same problem should look similar. For my P. membranacea, the problem seemed to be worse with high temperatures and lots of sun.

Here's what I was told is chlorotic P. membranacea. It looks piinkish in spots because the undersides of the leaves are often purple.