It could be because you have null values for those week/dates and that's why it is not plotting them on the map. On the bottom right corner you should see a 'Null Values' icon. Click on that select 'Show values at default position' and that should solve your problem.
You've got two dimensions on the Columns Shelf: Woche and Wochentag. That causes Tableau to generate a pane for each new value of Woche and break the lines. There are several different ways around this, depending on your view. You could use the exact date as a discrete (blue pill) and then use a custom header format:
Or use a date as a continuous (green) pill and use a custom axis tick marks:
There are also possibilities if you build your own calculated field to use as a discrete header. I've attached a workbook with the two options above.
panes break lines.twbx 1,008.5 KB
Thank you for your answers!
Using a calculated field the right way did do the job!
I "simply" added two fields to my time dimension calendarweek and day_description (Mon, Tue, ...) and concatinated the in formular editor: calendarweek+day_description
In that way my WochenTag= DayOfWeek has no relation to the year or a certain date and I can use ist as dimension.