So I used to use a pre-built gaming PC with a 1050ti and a 4K monitor but I played all of my games at 2160x1440. I built my new computer myself and upgraded to a 1080ti, but I've encountered a new problem and I don't know what's causing it. My games no longer let me enable 1440p, I'm stuck at 4K and the next option I'm given is 2048x1536, which I've never seen before and looks awful. I've tried using a custom resolution using NVIDIA's control panel but when I try it that way it looks blurry and stretched or I get black bars on the sides. Any advice? I have no idea what the hell I'm doing at this point. I'm assuming it's my GPU because I'm using the same monitor and I've never had this issue.