Hello people!
I'm trying to create some moveable objects on my game, everything was ok, but one of them (a slope) is now sliding a bit when the player stay on top of it, as you can see here:

Both nodes, the slope and the player, are kinematic bodies.
Player script:

Slope script:

I tried to use move_and_slide_with_snap, instead of move_and_slide, but the result was the same.
Btw, I have another moveable object that is a cube and this strange behavior doesn't happen on it.
Any clue about why it's happening and how can I solve it?
Thanks in advance.