Double stacking devotion aura

So, there were 3 paladins in a rdf hc group, all lvl 80 obviously, me + tank + healer.
I had ret aura and besides mine I saw a double devotion aura. The icons were very similar but a bit different. One tooltip said +1205 armor (normal non-improved aura) and second was +1200 armor.
Checking my armor - I had just over +3000 armor in total, from improved devotion aura of the tank (+1807 armor, tooltip does not reflect that) and from the second unknown aura of +1200.
I could not switch to devotion myself - more powerful effect active.

How is this possible?

I have never seen more than one devotion aura and I cannot activate an aura of lower rank myself, only rank 10 (max at lvl 80) works.

You were in Caverns of Time with Arthas. He projects his own aura, nothing strange here.
Case closed

It was rdf hc in Ahn'kahet: The Old Kingdom

Pretty sure it was two auras from two paladins, tank + healer. And I saw the +3000 (a bit more) armor on me - tested then outside with tank spec etc and best I could do solo is +1807.

Perhaps it was two different ranks from each of the paladins?
Weird, though.