biped upper bone can't moving together (video include)

[poet9789]

Hi, I'm working with a biped animation.

Yesterday, my biped is moving okay.

But, today was not. When I select foot bone and moving, upper bones cannot follow together.

Just only foot bone moving!

So, I make new biped next to the made first.

New biped is moving well! when foot moves,  calf and thigh moving together.

Is there any solution or cause? 

Should I end up creating a new one?

[vania_craft]

It could be because you rotated the calf on 360 degrees , try reseting pose by deleting keyframes (if you have any) then switch figure mode on and off

[projinf3d]

Possibly that its set to IK & not FK?.. check within biped settings...