Bug in dalaran arena?

Hello all,

around 2 weeks ago I started getting annoying bug in dalaran arena, when whenever there's a priest on the oposing side I don't see his character. It's as if he was invisible. When I target him thorugh Gladius addon, it shows the small red circle underneath him but I don't see the character itself. The bug was not happening before that and it only happens with priests. I can see all other classes just fine.

Am I the only one that get's this? If not I would appreciate any advice how to deal with it.