Cant use sequential shifter

Hello everyone,
Just bought the game and I have a modded G27 shifter turned into a sequential shifter, basically 3rd is shift down, 4th is shift up.
I binded 3rd as shift down and 4th as shift up, but everytime I tryt to play, that will not work.
It-s always on neutral and when I try to shift up, its goes into 4th!
Or if I try to shift down, it will go to 3rd. Everytime I bind it correctly, it just completely ignores my binds, I even re-check and 3rd and 4th are not binded at all, so it’s impossible for this to h appen