[Framers] Sending my email again with placeholder tabs

[Catherine Forrest]

The tabs in my previous email were replaced with question marks. I'm sending this email again, substituting "<tab>" for tabs.
The hierarchy of bookmarks in my FrameMaker files (FM 2015) are not reflected in the PDF files.
In the FM bookmarks, the hierarchy looks like this:book title <tab>chapter title        <tab><tab>1heading          <tab><tab><tab>  2heading
In the PDF, the bookmarks look like this: book title <tab>chapter title
 <tab><tab>chapter title
 <tab><tab><tab>1heading <tab><tab><tab><tab>2heading

"Chapter title" is in two different positions in the PDF bookmarks, but it should only be indented below "book title".

BTW, I selected the bookmarks by opening the book file, selecting all files, selecting Format > Document > PDF Setup > Bookmarks, specified the hierarchies, and clicking Set.

I've searched the Adobe forums and haven't found any help. Help! This seems like a really simple issue. What am I missing?

Catherine