Mundo W Invisible

I wasn't able to take a screenshot but my W was invisible(had the Pool Party Mundo skin). It was annoying that I couldn't see the balls of fire so I had to check to see if I was dealing dmg to myself to make sure it was working. Other players could see it, just not myself. This was a few days ago.

Edit: Seems to have happened in URF game and ARAM game. Works in the practice tool.