Cant read 2 inputs at once. Im using the latest version and everything else works on the other cores and roms ive used, Im using wired xbox one controller. Im also running on pc. No inputs are contradicting.

Looks like RetroArch has support forums here: https://forums.libretro.com/ (I found the link on their website). I would direct all questions and issues there, they are the best ones to help you with something like this.