Unity Start not called on build, but it does when testing

I've made a dice app as a project to learn to work with unity (it was so good in my eyes that I put it on the google play store) but when I downloaded it from there, the Start function of at least 2 scripts isn't called and I have no idea whether the other Start functions are being called.

Here you can see 2 of the Start functions that aren't called

   void Start()
     {
         light = light.GetComponent<Light>();
         GetComponent<Button>().onClick.AddListener(TaskOnClick);
         rawImage = GetComponent<RawImage>();
         isLockMode = false;
         rawImage.texture = getIconLock(isLockMode);
     }

 void Start()
 {
     Screen.fullScreen = false;
     Dice.AddDie();
     Input.gyro.enabled = true;
     GlobalConfig.onShowShadowsChanged += onShadowsEnabledChange;
 }

They work when I use Unity Remote on my smartphone and they also work when I just use unity without the remote...

the first script is attached to a UI element and the second script is attached to an empty GameObject called 'App'

It's also even more weird because they used to work but then I switched pc's (but used the same code). I think something is wrong with the building itself