Windowed Mode issue

I have a problem where my resolution won't scale right. It was fine when I was in windowed mode originally. The resolution was at 1280x720 and the game would use that resolution just fine at like 30 fps. When I switched to fullscreen and then went back cause fullscreen makes it blurry, the window got really small for supposedly being at 1280x720. Whenever I try to make expand the window, it instantly drops to 5-7fps. Just on the title screen. Also everything is super tiny, like the mouse and chat box when all the settings are where they were before with the size, so it's not a matter of just increasing their scale. This issue is only happening with the directx11 boot up. When I turned it off to use directx9, it booted up with the resolution scaling it was at before I played with the settings. However, I feel like if I change to fullscreen with directx9 it'll do the same thing.