When clicking on the "Special Abilities" menu, it displays two separate instances of Darkness on the ring, right next to each other. It has never occurred before now, and I noticed it just after logging in. I relogged to see if it would fix itself, but it remained. My character is a Tiefling, and thus should have Darkness, but not twice. The last thing I did before I logged off previously was to complete my CDQ and take my first level of Shadowdancer, though I don't know if that's related to this.