Looking for mouse and controller help

My controller is controlling my mouse in the background , I run multi monitor’s . And clicking on stuff and moving it around. It didn’t use to. And every once inawhile if I pause with start, and go back to playing it stops. Not always, but say 20% of the time. Also when hitting left thumb stick to run, it will shoot , even though I have default mapping. I’m confused. Is it an Epic games setting? Is it a Windows 10 setting? Direct X, Borderlands? Combination?