Can't get full resolution on monitor in Catalina

Just switched from Clover to OpenCore 0.5.9. No issues getting full resolution (2560x1440p) before using built in graphics (HD530). On opencore, my monitor maxes out at 1900x1200. I have gone into the display preferences in Catalina, but cannot select anything higher than 1900x1200.

I've double checked the monitor itself with another computer. I followed the Skylake guide. I ran the sanity checker and didn't have any flags come up. Everything else appears to be working fine. I'm using the WhateverGreen kext.

I have an intel I5-6500FC & ASUS H110 motherboard.

Let me know if I'm missing anything or people have ideas... Thank you!