Cubase creates new project for each Save

Hi,
I have a problem that started happening recently - every time I save my projects, there is a new project being created.

you can see here a Screenshot of this hapenning:

https://www.youtube.com/watch?v=uAPbnAM0SjY&feature=youtu.be

*play in on full screen to see it well

I tried to uninstall and reinstall cubase, but the nothing changed.

What can I do?