GC controller still rumble with MayFlash GameCube adapter

[Safirion]

Hi,

I just bought the MayFlash GameCube adapter, I have allready install the driver but when I plug a controller in the adapter and launch dolhpin, the controller rumble (small rumbles, not normal rumble) every time !

It's very disturbing 

When I exit Dolphin, GC controller stop to rumble.

I use official GC controller but with unoficial controller, it append the same thing.

I have Win10 (build insider 10525) and Dolphin 4.0-7495.

Any idea ?

Thank you by advance

Edit : When I connect the adaptader after the launching of Dolphin, controller rumble every time with normal rumble (like rumble in game). I have to exit Dolphin, unplug and plug the GC controller adaptator and restart Dolphin to have the small rumble.