Revisiting main slide - Ending up in the same position where user left the slide

Hey all! Originally inspired by the Interactive Guide With Parallax Effect I worked on this little project. And I ran into an issue I hope someone here might be able to help with:

There is a main screen. With the arrows, the user can explore buttons and navigate to slides in different scenes. When revisiting/returning to the main screen, unfortunately the users won't end up where they left the scene but in a different (random?) part of the screen. I tried different things but can't figure out what the issue might be. I attached the storyline file. Can somebody help?