Tessitura Extractions

I am trying to extract a list of constituents from Tessitura who have selected a particular interest. I am basing the extraction on a keycode containing; 'Constituent Interest' 'IN' 'X Interest'. The extraction is pulling the correct people, but it's also getting a few people who have not selected the interest specified, or in some cases have not selected any interests at all. This same problem also arises when I build a list. I can't see any reason why the constituents have been pulled by the extraction or built into the list when they do not have the specified interest.

Has anyone else had this issue or have any advice on how to resolve it?

Regards,
Samantha 

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