IBM is not supporting fixget actively and so you would find such discrepancies with fixget catalog.
With BSA 8.7, option to create catalog using suma(fixcentral) has been added to resolve this.
What version of BSA are you on?
we are on 8.6, talkign to support now about getting a hotfix to get FixGet to work with 7.1
we cant use SUMA since we are using a proxy