Unwanted menu after duplicate page

When I duplicate a page I get an unwanted top menu. This is a website with an A-section and a B-section. When I duplicate a B-section page, a menu from the A-section pages is at the top of the page. This menu is not in the Rows/Columns, so I’m thinking it must be from Global Settings or Themer Layout? What can I do to remove this menu, and can I make sure it gets deleted only from this page, not the entire website.?