Determination virtue still earning at rank 6

I'm a bit baffled. My 61 Hunter's trait panel shows Determination as still earning, even though she has completed all the low level slayer deeds, etc. to get it to rank 6. Whenever I've encountered this before it's been because I failed to do some low level deed in the Shire or Ered Luin, but that's not the case this time. I've checked that I've completed all the Bree, Ered Luin, and Shire deeds for the virtue.

Any thoughts as to why I'm still earning this virtue and can't equip it?