The American boxer's hair came off during the fight after punches.
According to Lent.az, citing foreign media, Jarrell Miller lost his wig after being punched by Kingsley Ibe.

Miller eventually defeated Ibe by judges' decision: during the celebration of the victory, he tore off his wig and threw it into the stands - one of the girls put it on her head.

Miller himself said a few days before the fight that his hair was falling out: he poured his mother's household cleaning products on his head instead of shampoo.