Everytime I deadlift a Panda commits suicide. True story
Vide from behind and side.
Could be an issue with your knee tracking poorly, do you push it out enough?
Knees in front of the toes isn't an issue afaik if they are pushed out. You want to push the knees out as you go down rather than forcing them out when you get to the bottom.
*VMI get pain in just one knee, where the VMO meets the patella:
I'd do that kind of stretching with my back on the floor and feet on the wall, much better.
I wouldn't necessarily expect them to be sore, but you definitely should be using them.
Have you read the OP?
Post a video.