Visitor Log ok - Dashboard and all other pages with no data

Hello all together

I’m new on Matomo and have one “big” problem. On my dashboard, pages and widgets I can see only some less user which creates some tracking data.

But as you can see, the visitors log is full of data:

Also everything works fine, if I create a new segement. Then I can see all the data. But it looks like the default segement is not working properly.

Have any one an idea what’s wrong here or what I’m doing wrong?

Thanks a lot for you help.