When retrieving applications and requirements in GIFTS, there are three ways of updating long text fields. The first option is to append the new text to the existing text. This is usually the cause of your long text fields having duplicate information, as the same text is appended to itself.
The second option is to have the new text replace the existing text.
The third option is to ignore the new text completely, and keep the existing text.

Please note that each of these settings can be changed for organization background, request project description, request evaluation and my blueprint long text fields independently. So you could set organization background to replace the new text, but project description to append the new text.
If you have GIFTS Online, you'll have to contact Microedge Technical Support at 877.704.3343 or email helpdesk@microedge.com in order to have these settings changed.
If you have Microedge GIFTS or GIFTS Alta, you can change these settings by launching IGAM > Tools > Preferences > System Wide > Updating GIFTS.