Have this issue as a Holy Paladin. I put in a ticket about it because I was like “what gives”? and at first I did receive the answer that it is supposed to be a tank conduit. This GM then suggested that I switch to Prot in order to get it to upgrade.
My response was:
“Ok but hang on, if it’s for tanks why does it say it increases my Intellect? And do you mean to say that I have to swap to Prot to potentially upgrade a dozen other conduits before I get lucky and have this one upgrade, and do it again for 252? And why then is the Condensed Anima Sphere not considered a tank conduit?”
I then received this response:
“I do have a similar issue myself as a Warrior, when all my 3 spec conduits have been upgraded to 226 by using Soultwining Crescent, Adaptive Armor Fragment was still present as ilvl 213, but it turns to 226 a few days later.”
It was suggested to put in a bug report and follow this thread for updates, so here I am.
Hope this helps.