Volibear cant auto when he activets his ult [gameplay]

I was playing a ranked game of voli top with smite tp. Everytime i lciked ult in a teamfight voli didnt want to atack anybody but just hugged the enemy team until i ran away or got killed. This bug removed 1 member of the team as for damage. This bug happed first time to me so it may be rare (1/10 maybe). I had bought cinderhulk, glory and ninja tabi and was working on a spirit visage. maybe this bug is conected to the items.