Resolution broke after changing to fullscreen

When I changed the resolution settings to fullscreen, it zoomed in to like 300x300 resolution fullscreen on a 1366x768 monitor. I tried to restart the game to see if it would fix, but everytime I start it up it brings me to the alpha page and is zoomed in so much that I can’t even get to the home page to even join a server. I tried validating the files and it still didn’t work. So basically, I can’t even play the game until they fix this problem.