Not sure what happened here, at first try. But some of the right toe foot vertices, stay stuck on the ground.
As if the bone ignores them.
I Just selected the mesh object, added the Armature modifier. And posing the model in shape.
I’ll investigate, CSI-style 
Because I already had automatic weighting applied, some vertices were lost in some groups. You can remove the armature, but those groups still exists and re-used.
I deleted those old vertices groups and tried it again. now everything works as expected.
Then I added more mesh info, which distorted the whole pose. It’s now becoming something like modern art. But I like the effect. It’s trail by error…
Happy render times.
