Yes, absolutely right. All bets are off during puberty. You're undergoing massive physiological changes, caused by hormonal changes the likes of which you'll never see again (until menopause, if you're female). I had a lot of this trouble as a teenager; it often seemed like I simply had no retention, and I consistently forgot skills (mainly math) that I had thought to be committed to reflexive memory.

My bet is that this stuff will be sorted once your body settles down. And maybe well before then.