I keep having the problem that my puppet is missing symmetry. When I add the walk behaviour to the legs, and name al the parts (knees, toes, ankles, hips) I keep having the rigging issue.
I started with the existing pupput Blank. I edited the puppet in Illustrator.
I see that each leg has a behavior on it. Is this 2 instances of walk? If so, delete those behaviors - all you need it one walk behavior at the root of the puppet: up where it says Blank (Illustrator) and the behavior icon with a 9 next to it.
My guess is you just have a bunch of walk behaviors when all you need is one.