Slightly? 
That’s definetly weird. Maybe the root bone’s rotation is off. Try adding the root bone manually by following the tutorial I’ve provided in my initial reply. Then make sure you retarget them correctly, you can also consider using a custom retargeter for that purpose. As for your character having weird feet movements that you mentioned previously, we should also make sure their IK rigs are retargeted properly. Here’s a tutorial on it:
