So it seems that the FNA Framework has added support for ps1/2 pads.
I'm not sure what I can do to disable it as it's all happening in the background. I'll look into it some more.
Hi! I wanted you to know that I have no longer this problem:
The new x360ce version let you convert dinput to xinput and hide the original dinput pads, so now I don't have the double input problem anymore. Thanks anyway!