Seems it was because I hadn't copied some keyframes from one C to another. 

Needed to be there before moving the keyframes for left leg back 12 frames.

Sounds like you've got the hang of it now Alispark.

Good job.

(h: keep this trick in mind for your workflow.  You can copy any pose and paste it onto another control too.  This can speed you up later down the road if you think outside the box)