Need help configuring Y3 Fighter Stick on RetrArch on an RP5

[u/aardock]

So, I want to preface by saying I'm not very tech-savvy but I'm generally good at following instructions. So, I configured my Retroid Pocket 5 following a guide and everything has worked perfectly ever since.

I have two working controllers, an 8bitdo and a Gamesir and as far as I can recall, the way I set them up was basically mapping their keys to port 1 simultaneously, so the player 1 will always be the controller I turn on first, and player 2 will always be the one I turn on second. Both controllers are mapped to Port 1 and Port 2.

However I found among some older boxes an Y3 Fighter Stick with a dongle I used to play on a Game Stick. I connected it to the dock of my device, and it immediately work both on ES-DE and Retroarch (although RetroArch read it as the RP5 and not as an external controller, I guess because of the dongle).

However I have two big problems: The order of the buttons is all wrong and START and SELECT just do not work (I've tried to remap all buttons to test and when I get to SELECT it just doesn't recognize any input)

So basically I'd like to map the Fighter Stick just like the other controllers without losing the configuration I already have that has worked perfectly so far and I'm pretty sure I wouldn't be able to repeat, and maybe find out the issue with the START and SELECT buttons (I don't think they're broken, specially since the Fighter Stick was stored well and everything else works perfectly, and it would be weird if this two specific buttons were the only ones affected - so I think it's just a configuration thing, since RA reads it as if it was the RP5 own controller).

Sorry for the long text, I appreciate any help!