I need your help with this gba

[jkm81]

I modded my first gba many months ago, replace the screen and shell and put a rechargeable battery in it. Honestly, I did a terrible job, trimmed the shell too much and the screen didn't have enough surface to stick on, so i had to glue the screen to the shell and I drilled a hole in the battery cover that doesn't match the charge port. Later the shoulder buttons started to fail and i replaced them. Two modded gba more later one of my cousin dropped my gba and broke the screen so i replace the screen and the shell but now the R shoulder button does not work on mario kart only.






please help me find a solution and if i need to replace the shoulder buttons recommend me some good ones.