Parameter Info Not Consistently Working

The little Parameter Info popup that shows up when you type an open parenthesis for a method call or hit Ctrl+P as of recently doesn't seem to want to show the actual parameters for the method selected, but instead just "*args, **kwargs". It works on some methods, but not on most, even ones that it worked in the past on the same project. I've tried invalidating the caches to force it to reindex in case it was something like that, but it didn't help.

Any other things I can try? Maybe it's a bug?

It's making me very sad.

EDIT: It's also able to find the modules the methods are coming from just fine and if I hover the mouse over the method itself, I'll get a documentation window listing info about it, including the parameters.