Toc navigation panel has chaptertitles listed 2x

Question

I've really been working on this for hours and days using all resources available.
I know that this is an easy fix  but I just cannot get it.
Issue: TOC  generation
When I open up the indesign book in adobe digital editions
the first page is a visual of my TOC (like in the print version) and each chapter is highlighted.
- if i scroll the chapters are all visible
PROBLEM
yesterday -  i was fine - finally - or so i thought.
today - i have added 2 more documents to this same book; used the same anchor and hyperlink method
but now the navigation panel looks like this.
RESULT 
In the resulting navigation panel in adobe digital reader I now have these listed 2x. 
-preface    clicking here does nothing
-diagram   clicking here does nothing
-chap1       this works
-chap 2      this works
-chap 3      this works
-chap 4      this works
etc.            this works
-preface     this works
-diagram    this works
Do you know why I am getting the listing 2x and why the first copies of each do nothing ?
Any assistance would be greatly appreciated.

Answer 1

dopfel wrote:
thank you !!
it worked well.
- i love this 'opensource knowledge sharing thing'....  more about that
later.
- i will continue to add the remaining pages-documents such as dedication,
acknowledgements (i am adding you !!);  diagrams, list of website references
etc. etc.etc.  it will take a while.
if at all possible, may i email you again regarding a couple of incidentals.
i love to self learn and have been doing this all along but sometimes just
asking a questions saves so much time ....
below is the first one regarding formatting.
there are 'no' blank lines between my paragraphs and i am not certain about
which is the most efficient way to do this.  it would take hours to change
the leading and i think i tried changing it from the default 10.8 to 14 then
18 and i did not notice a difference.
again thank you.
did you get these past couple of emails?  i am just replying.
regina
note.
book written in word on a mac and converted to pdf for upload to
lightningsource, createspace, kindle - initially; just getting to epub this
past week and a half.
- used my 'word' document - split it up so each chapter, part is it's own
doc.
- placed them all in indesign and saved as .indd
- the 'only' formatting i used is in indesign.
- i set the chapter (title of page such as 'dedication') to paragraph style
1 and left justified things.
- this is the only thing that i added when i created the toc.
Question:  is this going to a problem when the ebook is downloaded to
devices other than adobe digital reader:  such as ipad, sony reader, kindle
- maybe i might be best off setting styles to all of the text in the
indesign docs but i really am not sure where to begin and that basic
documentation or tutorial is really eluding me.  colin flemming and gabriel
powell's tutorials helped but were not clear about the toc - which YOU were.
On Sat, Sep 4, 2010 at 2:12 PM, peter at knowhowpro <[email protected]
Glad my suggestion was able to help you understand the problem and resolve it.
Just to clarify, this is a forum where your postings appear, not direct email to any forum participant. We're all volunteers, users like yourself, not Adobe employees. Forum visitors may choose to reply to or ignore any posting.
Regarding your additional questions, please separate the many questions you're asking here, and post each individual topic in a new thread with a clear brief subject line. A clear subject line helps forum participants decide if they are interested in the question and if they feel they can offer a useful response.
Regarding tutorials, search Google for "indesign tutorials" and/or "indesign learning" without quotes to find information from many additional resources including and beyond these Adobe forums, and the ones you mention. If you only want free ones, search for "free indesign tutorials" and/or "free indesign learning."
HTH
Regards,
Peter
Peter Gold
KnowHow ProServices