UI buttons working in game mode and (Build and run) but not in build (exe file)?,UI buttons working in game Mode and (build and run) but not in build ??

I have a calculator application made using unity 2018.3.5f1 . when running in game modes, the app works fine , same goes when i build and run the app. However the buttons are clicked but takes no action when when i build the app on windows and using the exe file. I don't know what else to do, isn't build and build and run supposed to be the same thing? yet build and run works but not build.