Ok, I just noticed that this problem also occurs with zenpage. I haven't checked any other themes. When there are more than one subpage only the first one showns up in Safari. In Firefox all of them show up as expected. The 2 pages are not in the code that Safari gets.
Problem solved. It was my mistake - sorry about that. It helped to actually publish the pages and in addition not to view the site as admin in Firefox and public view in Safari.
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Regards, Peter