[Gameplay] Piltover Customs Blitzcrank Skin issue

Sometimes the ult damage wouldn't go through with the piltover custom blitzcrank skin. The damage goes through on minions but sometime's not to champions ex. I Q E R caitlyn, Q and E damage went through but not the ult. This happened the second time when i pulled in Yasuo and ulted. I tried the same combo with blitzcrank's other skins and the damage went through.