For the last month or so, I have begun experiencing increasingly strong pain in my inner hip/groin area during and after squatting. It feels like it's in the joints. I feel pain and instability while walking up stairs and now while walking or lifting the legs in general, and it lasts through my off days (though weakens over time). Today I was unable to complete my working sets due to the pain. I've seen two potential explanations here: knee slide and hip impingement. I'm hoping one of the experts here can help identify the cause. Below are two form check videos I took at a lighter weight (175 lbs; my working set is 220 lbs).
Side (sorry for the poor quality)
Back
Many thanks for your time!
Edit: Sorry, I meant to post this in Technique. Don't know how to (re)move it.