I'd uninstall anything like RivaTuner man. That sounds like quite a mess. Remove any monitor altering apps and profiles you have, and go through the video I linked above if you have an Nvidia card. If you have an AMD card, do the exact same thing but use ToastyX's CRU.Exe (included in the package) instead of the Nvidia Control Panel to create your custom resolutions. Otherwise we have no idea if you have anything that's causing conflicts on your system. Because what you're describing is an odd scenario that shouldn't normally happen unless something is wrong.