Plutonium

Hey So a couple months ago my res on bo2 was fine (2560x1440) Had zero problems with my res and settings. I took a break from the game for about a month and came back and now the max res I am able to go up to for some reason is 1920x1440. I have tried changing it through console commands and also via bootstrapper and absolutely nothing has been able to work. Any help would be greatly appreciated. Just want my 2560x1440 back