I took the Death Knights talent in the Summon Skeletal Mage skill specialization. This should let me cast Summon Skeletal Mage to replace my existing mages with Death Knights. Instead, I ended up with two Death Knights and one Mage – using the spell again just replaces one of the Death Knights with another Death Knight. https://imgur.com/gallery/gBaGqNM shows my minions and that mage I can’t get rid of.
I am pretty sure this will resolve itself when I log out or when the mage dies, but it’s pretty annoying right now.