Problems with game after build (android)

Hello ! I just started working on unity. I’m making an android rpg but I have a problem on the device. On pc everything works perfect , when I try the game on mobile the quest system and the inventory doesn’t work. When I press accept quest it show task : kill 0 / 1 enemy , it shows the progress kill 1 / 1 enemy , but the complete button doesn’t get active and the Reward doesn’t show what I get (Experience and Items(title)). When I interact with the NPCs the Accept button is setActive(true) , when I complete the quest the accept button is set to false and the Complete button is set to true. The inventory instantiates the slots , but the items are not loaded. Why on Unity everything works exactly how I want but on android isn’t ? I made the inventory with the help of Let’s Make Rust and the quest system with the help of Creagines.

Oh and one more thing , everything worked find before I added the inventory and items. I tried to delete everything related to inventory and items but the problems remained.

Sorry for my english ! And thanks in advance !

There’s really nobody who can help me ?

I’m sorry for saying this but this is the worst community I’ve been in. Usually people try to help even if they don’t know exactly what’s wrong. They try to help with little ideas. I posted here and I’ve posted on Answers but nobody is willing to even try and help me.
Have a nice day !