Tarantula Molts Upright

My B. hamorii molted on her stomach. It was very unexpected and I tried to capture the whole molt on a timelapse. I monitored her molt to be sure she got out of it safely due to the odd position she chose to molt in. She has always been on her back in previous molts. ***HER SUBSTRATE WAS CHANGED AFTER SHE HARDENED DUE TO TINY MEAL WORMS THAT SOMEHOW GOT IN HER SUBSTRATE** NOTE: she was missing a leg during a transfer accident, so the new leg that came back is small and stumpy. She lost this leg back in June, and she has been moving around and behaving normally for months.