Squatted down quickly and felt/ heard pop above knee cap. hurts to bend but can walk with some soreness. pops every time bent above and below knee cap?

Kneecap subluxation: Sounds very much like patellar( kneecap) subluxation ( slipping in and out) of place.I would suggest seeing a board certified ors for evaluation . Initial treatment often involves strengthening the quadriceps muscle and patellar bracing.This easy 'slipping' suggests generalized hyper mobility and can affect other joints.Best of luck!