The glutes are hard to pinpoint, what kind of pain is it? Sharp, dull, burning etc. Where in the ass does it hurt and when during the movement (move your leg out to the side, out to the back, flex your hip, sit down, squat, lunge yada yada and find when and where in the movement it hurts). It could be a piriformis issue, glute strain, glute medius issue, hip joint issue, sacroiliac joint issue, lower back issue radiating its pain down your leg, sciatica. Touch your ass when it hurts and find the spot on a anatomy model.
Write it all down.