[n64] press button A, B, Y, X activates C buttons too

Hi everyone ! I am new with Retroarch and obviously on the forum. I have a problem with my generic usb controller. Retroarch system recognize my device like retrolink n64 controller. When i play on n64 emulator, pressing the buttons A, B, Y, X activated ā€œCā€ buttons too. I try to change the config but the problem is still here. How can I fix this? Help please ! :sob: