Hi @socialswim
This usually happens to me when I have ticked "Disable Fullscreen Optimizations" on the games' .exe, or it might be that the game is running in exclusive fullscreen.
I have reported an issue to AMD with DirectX11 games stuttering with bad frame rate spikes when a game is in Borderless Fullscreen with VSync enabled but luckily not in exclusive fullscreen. I do not think they have fixed it yet.
Kind regards