Have you an idea of what’s going on?
Apparently, the problem is caused by the strip “CLIMB” that makes the character do the animation of climbing over the walk cycle. As you can see in the viewport everything looks ok (I was so happy) then I rendered and I noticed that the character gets deformed.
Deactivating the CLIMB strip the problem disappears.
Well, I’m not sure about the meaning of what I did, but apparently switching on the two buttons highlighted solved the problem.
I know I use the second one when I want to see the result of a modifier in Edit Mode, I don’t know what’s the effect of the first one.