Necromancer azir's voice, is half alternative/normal voice

Hi, I bought Necromancer Azir skin, and, since a few days, I noticed that his voice with this skin sounds like a "necromancer" on some sentences, and is just "vanilla azir voice" on other sentences. So Azir sounds like two different people during the game, and I know it hasn't always been like this. I think the voice is one of the main feature of the skin and I hope this bug will be fixed soon.