@cristian-muñoz Okay, so you're telling, you have the joystick's mapping properly, but have you tried REDO this mapping after discovering that is not working in Kodi?
Also, you seted this control to player 1, but, have you tried to leave player 1 as automatic, and enter the kodi, to see if it works?
Another possibility: you claim that your joystick is a ps3 shawan, did you even try to change the driver in the recalbox.conf file? Enter the file "recalbox.conf" and search for "controllers.ps3.driver", there are 3 possible drivers, and 2 of them claim to work on shanwan joysticks, my file for example is like "controllers.ps3.driver = bluez", but can be changed to "controllers.ps3.driver = shanwan".