Help with weird Rocket League key bind issue

Here is my current bind setup. Specifically I am having issues with my left trigger which I tried binding to the xbox b button for boosting (originally i had it bound to keyboard but I changed it all to xbox to see if it would fix the problem, it didnt)

When I pull it, my car will boost until I run out, and then it will brake. When using a keyboard or an actual xbox controller, nothing happens. This is a problem because ill be chasing after a ball, run out of boost, and then suddenly brake.

Anybody see anything weird with my setup that makes it so that it reverts to some other key bind forcing it to brake when I'm out of boost?