Frozen/disappearing units glitch

sometimes in any game I wont be able move some of my units. Usually only from province for no reason. Once I had half my army stuck like this costing me the game. Yes I've refreshed, yes I've restarted my computer, and yes I've made new tabs. Nothing has fixed the issue. As for the disappearing units, I'ts only ever happened when multiple groups of armies are fighting at once.