I still cannot figure it out. There're numerous articles about numbering but I cannot find a good article which helps me with my problem.
InDesign doesn't respond correctly. Is this a standard issue?
your text frames must be linked or better in a single frame to get the right order.
Thank you guys!
Somebody else helped me out.
To solve this problem I have to put the middle of the textbox of the chapter on the right page (left-side). Paragraph numbering follows automatically.