Not all parameters considered when returning to search screen in BWC

On 12.1.3, in the Buyer Work Center / Agreements tab / Search, the search parameters that are included are the supplier's name and Control Status IS NOT Closed.  Click Go, and two CPA's are returned.  Click on one of the agreement numbers to view the details, then click the Return to Agreements link.  Now the search results show 3 CPA's, and one of them has status Closed.  Why was one of the parameters ignored upon returning to the search screen?

Are there any notes that address this issue?

Thanks,

Heidi