Position of Child seems to change position of parent. Why?

[leurs]

I have the following strange behaviour in Unity 2019.1.

I have an empty object “Level_0” at pos (0, 0, 0).

Then I add a Prefab at pos (0, 0, 0).

When I now make the Prefab LevelGround to the child of Level_0 the position of Level_0 seems to change. It’s still (0, 0, 0). But it is shown at the position of the Prefab.

Can anyone tell me why this happens?

[leurs]

I found out that I can change from Pivot to Center in my View. When I change to Pivot the position is shown correctly: