Can you lose height at the age of 17?

lst time i did it, which was in January,i had lost an inch over 8 months, and a bunch of weight. But yeah, i deff didn’t cheat but posture should be checked

Could have just been a mistake. But I heard you’re slightly taller in the morning when you wake up because throughout the day gravity pushes your body and makes you slightly shorter …..

it was messure at the same time of day each time

You should try measuring several times to check for errors. Maybe you measured your hair (if it was a higher style) and when cutting it, you lost said height.

I don’t really know how else to explain, since at your age, your bones haven’t fused so you shouldn’t shrink for a long time. Same thing happened to me though, I used to be 5’4”, now I’m 5’3” and my posture is very good.