DK - BiB keeps trying to equip trinket twice

I only have one “The Jailer’s Key” but BiB wants to equip it twice for my Unholy spec (See Amarik-Anvilmar, spec priority is Frost, Blood, Unholy).

On the Unholy BiB web page, I change one of “The Jailer’s Key” to “Unquenchable Doomfire Censer” and I get the dotted box around it but when I click Save, it reverts back to two “The Jailer’s Key”.

How can I get past this?