Walk cycle - Difference between Left and Right

Hi ChAnimator People,

I am going crazy over here.

I have been wrestling with my puppet's walk cycle for 2 hours now and I can't figure out for the love of god why my character doesn't walk the same way between left and right. It walks fine going (his) left but completely slouches and is compressed a little bit when walking (his) right. I have checked the rigging again and again. I have checked the mesh again and again. I am going crazy right now.

Here is the .puppet: https://drive.google.com/file/d/10EL8S81kK_UjelOL-Ks1XPN3gfUJGL_t/view?usp=sharing

Would really appreciate a hint for where I made a mistake.

Alassane