Unity dropdown automatically scrolling up

I'm having an odd problem with my UI Dropdowns that I don't think I've seen before. When I hover over an item, the dropdown automatically scrolls up to and hovers the first item, but the hover shading for the item I originally hovered over is still there.

It doesn't happen on a new project so I feel like it may be some input interaction that may be interacting with the dropdown (maybe VRTK). What would be the best way to figure out what is causing this behavior and stop it from happening? I tried detecting what's hovering over it to see if there was some other raycast, but that doesn't seem to be the case.