Cubase doesn't store my settings when ending?

If I open a project and work in it and then select save, and then close and then open it again it does not always looks the same as it did when I closed it. Cubase does not save mix settings, muted/solo channels are not the same as it was.
How shall I do to keep my mixer settings and so on to nex time?

I Use Cubase 8 Elements