Finger Curl Issues

I've ran into an issue that I have yet to figure out. Eventhough I did proper joint orientation, when I did my rig for the finger curl it's curling wrong. It's really hard to rig it the way the hands are modeled, they are at an angle between side and front view, and the fingers are slightly curled  on top of that. But for some reason when i implement my finger curl the skeleton curls 45degrees to the side from where it's suppose to curl in towards.