Skate 3 "jumping around"

I'm fairly new to RPCS3, but I managed to get Skate 3 up and running with Vulkan.  I'm currently using settings that have worked for other people, but I'm getting a strange effect that I know for certain isn't normal.  If I get off my board and stand still, my skater starts jumping around and bails repeatedly.  I am not touching the controller (the official PS3 controller), so it must be getting button inputs from somewhere else.  Any ideas?  Sorry if this is in the wrong section - I just signed up.

- goody_fyre11