How do I use my 8BitDo Retroflag Classic USB Gamepad with Lemuroid?

[Hund]

I'm using a 8BitDo Retroflag Classic USB Gamepad, which works just fine with RetroArch. However. It doesn't work very well with Lemuroid. :(

When I try to use it, it only changes focus on the virtual game controls from left to right (and wise versa). Weirdly enough, it seems to work fine in the settings.

It doesn't show up in “external device” section, either. I have no idea what I should do?