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Update:

After spending half the day on this problems, googeling and reading a lot of tips, I finally found somewhere, that my issue could be a problem of the viewer.
So I tried another viewer and the tree is shown correctly...

So, everything works fine now, sorry for the stupid question!

Dear NG,

my Latex Kung Fu can not help me with the following (supposed very simple) problem.
I also searched this forum but did not find a solution.

Attatched is a code for a pstree figure.
My own tree is a bit more complex, so I decided to try a simple exmaple from a textbook.
Even this simple ...