You may want to contact Tech Support to look into this. I would be happy to look into this for you, however I would need to see the config of the appliance.
I think what you're seeing is a defect 21685 which is in Email Gateway version 6.7.2 release note undre Bug fixes.
Description:Connection Control Deny List does not display the connection control type for one type.
#you might need to check your ade logs to know which rules was hit.