Can you share with me the page structure (I suppose you have group page with several child pages)?
In Sitefinity 4.4 horizontal with tabs navigation option will display GroupPage on top level and depending on the setting how to open pages (mouse over, click)
Click->Clicking the group page will expand the child nodes, but the url will not be changes because the click action is not redirecting, but expanding a tab in this case
Mouse Over->clicking the group page will change the url to grouppage/child1 as all group pages navigate to the first child page and display the contents of the first child page.
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