I was unable to find anything through my searches on google or the forum, maybe I'm searching with the wrong terminology..
Any position that I am in for over ~10 seconds that involves complete knee compression causes the back of my knee to feel stiffness/pain as I extend my leg and for several seconds afterwords (I usually just jiggle my leg to help loosen it). Examples of this compression would be sitting on my knees/shins with my feet extended, sitting in a deep squat, or laying quad stretches. Is this something that is normal to experience? The feeling has not lessened over time as I continue to use these movements..