@Substring because controls are mapped differently that i map inside recalbox, It Hurts messed up, when the 2 controllers are plugged.
If i plug only 1 controller It works like It should.
So when i map the controllers over retroarch, when i save config and load this config after, i lose the core, It have no core loaded, so i have to exit retroarch and maps on recalbox are lost also. It's very strange indeed.
In short, when i have only 1 controller plugged i got my mappings saved in recalbox and retroarch ok...
Oh, i used the core remap indeed, because some buttons in my controllers was opening retroarch hotkeys, so i mapped tem default (using Space on keyboard)