The first question I always ask, do you have or use any mods? If so, please remove all of them and reload your game and see if that clears you problem up.
Second, if you don't use mods, please run a WGCheck and then submit a CS ticket explaining your issue and attach the WGCheck report so they can see what is going on. Below is the instructions on how to do this.
Mahalo,
-Hapa
https://na.wargaming.net/support/en/products/wows/article/19431/