Text in Tag doesn't match what's Visible on the screen (Acrobat 8 Pro)

Question

I have been exporting PDFs from InDesign CS3 as tagged Acrobat 8 compatible PDFs. When bookmarking the PDF, I generally highlight the heading I want to bookmark and do a ctrl-B to bookmark it which copies the text and applies it as the bookmark text.
One thing I've been noticing is that sometimes the visible text is not the text which actually resides in the tag information (Created by ID CS3 - and it's the tag information that gets copied when one highlights and copies the text)
For example my heading read "Human Exposure" and when I make a bookmark from the highlighted heading (or copy and paste it into another application) it reads "Humanan Exposure" And if you look at the tag text, "Humanan" is what's reported. The original document had it right and the visible Acrobat document has it right
I have no clue how this is happening. It's either an InDesign CS3 problem or a Distiller problem
Has anybody else run across this problem?

Answer 1

O.K., I understand what you're getting at now...
No, it is a bold font (Times New Roman Bold).
I'll look again to make sure none of the line has also been bolded.
I'm starting to think that tagging is a little buggy to begin with, because the actual header reads as follows (it's two lines because it's in a double columned format):
Production, Use,
and Human Exposure
And if I delete the tag and re-tag it as text, copying the whole selection and pasting it (or bookmarking it) gives "P P P P P P P P"