We solved the problem! Our StackNavigator was the problem. Inside our StackNavigator we had an element called <Stack.Screen>. And we fixed it by adding this to our code:

`<Stack.Screen
 name="ActivateScreen"
 component={ActivateScreen}
 options={{
 headerShown: false,
 cardStyle: { backgroundColor: 'transparent' },
   }}
 />`

And especially cardStyle: { backgroundColor: 'transparent' } fixed it!