Battle tower bug

[Nixs]

While I was battling in the battle tower, the weavile that was supposed to have fainted is not in the screen but the last pokemon wasnt coming out. it continued on for about 3 turns when i try to attack the invisible sprite of the fainted weavile with garchomp and to end it with switching to salamence. Once i switch to salamence, the last Pokeball which should symbolize the number of pokemon alive was highlighted. After I tried to attack with my Salamence, the turn ended and the normal text where weavile fainted following to a pokemon switch continued and wailord was sent out but the pokeball for wailord was still highlighted