Weird Flag Bug

So, I am in the editor and I am trying to change Russia's flag(I already edited Russia and searched for another image of the Russian flag) to a Soviet flag, but it refuses to change to it no matter what I do. I've uploaded the image, clicked "save", and saved the game. Still, the flag did not change. Then, I did it again, saved the game, and reloaded atWar, went back to my map, and the problem still persists. Anything I can do?

Ah, thank you. Clearing the cache worked.