Animation Retargeting - Weirdness

After retargeting an animation from a skeleton I got from mixamo, I got this strange result:

Note the feet on blue guy lift up when they absolutely should not be doing that.

I’ve been reading the documentation and can’t seem to figure out why this is happening.

So, why is this happening and what are my options for fixing it?

Whats the problem? I can’t see any difference. There are just 2 extra bones on the herottp skeleton.

the feet are lifting off the ground after retargeting.

shorter legs.