The standard DITAmap stylesheet produces a level 1 bookmark by default whenever a level 1 Contents entry is generated.
If this is the cause then look at mappings for elements containing the text "BLUUUURRRY User's Guide"!
In the Content tab of the mapping you will see a control
Assign to ToC level: 1. If you unselect this control, the additional bookmark will disappear, but it may take the corresponding ToC entry with it, if you are printing your own Contents.
There's several other options, depending on how you are set up, including:
- Ditch the manually created bookmark and just go with the standard one.
- Disable the auto-bookmark creation, and manually create those that you do need.
I can give you more detailed instructions once you decide what you want to do.
Regards,
Geoff