Weird Achievement Glitch

So, I decided to track the Alliance-oriented Achievements for Midsummer, then decided to switch faction to Horde. When I logged back in, I saw that the achievements I was tracking as Ally were still tracked. Specifically, the Alliance versions of them. Clicking on them takes me to a blank achievement in the achievement log, and does not give me the option to untrack them. I have confirmed that I cannot track additional achievements, as these are taking up the place, and getting the Horde variations does not clear the Alliance achievement from the tracker.

What can I do, besides make a ticket to have my tracked Achievements cleared?

You can remove a tracked achievement by holding shift whilst you click it. (Or maybe it was Control. Just try all modifier keys)

Thank you very much, that worked!

Shift, by the way, in case anyone else has this issue.