sprite of pokemon not actually the pokemon in battle

[Darudeameno]

I was in a battle and suddenly it wouldn't let me switch into my alolan ninetales which was in slot 1. I instead switched into my aegislash which was in slot 2 after my landerus had died to his gengar. My opponent then sludge bombed which i thought was strange and appeared to kill my aegislash??

 

I then went clicked my ninetales assuming it was my aegislash.

I clicked the 2nd move knowing it was shadow sneak and it turned back into Aegislash.

 

Could this please be looked at as it almost cost me the game.