Hello. I have noticed an issue, when trying to control the outer leg on my side facing character. Ive noticed that the inner thigh seems to be connected well to the thigh, but on the outside part the foot seems to detach from the thigh layer, and the thigh doesn't bend at the knee. 

example of a correct working one and a not correct one . 

Maybe I've rigged something wrong but as far as im aware the sprites are all in their correct folders etc. 

My guess is, the ankle bone in the first image overlaps with the bottom of the leg sprite and the foot sprite creating a 'joint' between the two.
In the second image, it looks like the ankle bone probably doesn't overlap the bottom of the leg sprite therefore not making a connection to that body part.
If there is a connection it may be so borderline that it's not being recognized so I would recommend moving the ankle bone up a little and seeing if it has any effect.

- TET
Animation and Video Life
The Lazy Animator - Tutorials for Cartoon Animator