Problem with "favorites" change

[Bruno777]

Hello guys, i've recently bought a korg kross 2, still learning how to use it. I saved various combis into the favorites, and im using them with another keyboard as midi controller, so i have one program controlled by the midi controller, and one controlled by the korg kross. But, recently i started to play quick rythms in the korg kross, and after repeating them once or twice, the "favorite" that im into, changes. For example, im using the favorite registered into G15, then i start to play the quick rythms, and the program changes to the G14.
What can i do to avoid the change? why is that happening?