UI goes off center in gameview but not in sceneview

Hallo,

I created a smartphone that players can use inside my game.
The whole project is in 2d and uses UI elements.

I have created a smartphone in UI elements, that spawns at (0,0,0).
The screens are childs of the smartphone. And also spawn at (0,0,0), but they are slightly smaller than the smartphone, because it has edges. Just like a real smartphone.

The strange thing is, when the game starts it moves the smartphone from (0,0,0) to (250,0,0). And accordingly to the positions, the screens also move. But when the moving is done, the screens are slightly off center (+- 4 units). The position of the screens are still (0,0,0), but in the game view they are shown as something like (-4, 0,0). Even stranger, the scene view shows them correct, in center.

Does anyone know why this happens?

 

I don't know what you are referring to with your positions... But probably not what is important for the UI: the Anchors and the anchored position.
Check out the third video of my asset to get an Idea about anchors: https://assetstore.unity.com/packages/tools/gui/better-ui-79031