As a pally going ret you don't judge anything except Seal of Command before it runs out (Crusader isn't worth it for trash if you want to mana efficient of some sort). SoC produces no debuff on the target.
Or maybe he just has no target debuffs shown at all.
If you don't like target debuffs near your unit frames you can go for Elkbuffbars wich can show target debuffs, and your own buffs/debuffs in separate bars.
As far as i know buffalo only replaces your own Buffs/Debuffs.