I’ve been having similar problems with my PS3 Dualshock 3 controller via USB. I just tried a powered USB hub with no improvement during controller setup. The hub power supply is rated at 2 amps so it should be plenty to handle the controller.

same problem. I think it’s often counting releasing the button as a seperate keypress somehow. I got it mostly functional by holding down each button after i pressed it, ending with every button held down. it was a pain. Try the following in retroarch.cfg, it’s what I ended up with and it works. think L3 or R3 looks wrong; not many games use them so I haven’t tested:

input_player1_joypad_index = 0
input_player1_b_btn = 14
input_player1_y_btn = 15
input_player1_select_btn = 0
input_player1_start_btn = 3
input_player1_up_btn = 4
input_player1_down_btn = 6
input_player1_left_btn = 7
input_player1_right_btn = 5
input_player1_a_btn = 13
input_player1_x_btn = 12
input_player1_l_btn = 10
input_player1_r_btn = 11
input_player1_l2_btn = 8
input_player1_r2_btn = 9
input_player1_l3_axis = +13
input_player1_r3_btn = 2
input_player1_l_x_plus_axis = +0
input_player1_l_x_minus_axis = -0
input_player1_l_y_plus_axis = +1
input_player1_l_y_minus_axis = -1
input_player1_r_x_plus_axis = +2
input_player1_r_x_minus_axis = -2
input_player1_r_y_plus_axis = +3
input_player1_r_y_minus_axis = -3