Steps to reproduce:
1. Download and open attached project "repro_730401.zip"
2. Open scene "main"
3. There is an option in camera's script within inspector whether to trigger or not DontDestroyOnLoad()
4. Make sure it's checked and press play
5. Observe that the object with the script is pushed to the end of the hierarchy

Note: Same thing happens to the objects with children (the object get to the bottom w/ all its children in tact) and if the object itself has a parent - nothing happens