Questionable biopsy results - what could be causing my hair loss? (photo)

Suddenly experienced extreme hair loss about 3 months after extream stress as well as moving to a different country (I just turned 20). I was loosing hair by the handful. It got to the point that I couldn’t wear my hair down otherwise there would be hair everywhere. Dermatologist looked at scalp and was 100% sure it was TE as well as nurse who did my biopsy, did a biopsy and it came back as aga, derm and myself extremely surprised. Is there any way the biopsy could be wrong? It doesn’t make sens