Alt enter resolution problem

I accidentally pressed alt enter (toggle windowed mode) while playing insurgency and when I pressed it again to go back into full screen the resolution is significantly poorer and the ui is extremely buggy. I’ve tried changing to windowed and back to full screen again within the game settings but that hasn’t worked either

If you're still having this issue after restarting the game, see if changing the Launch Settings helps. Instructions here: https://support.steampowered.com/kb_article.php?ref=1216-JMTZ-0860