"When you have at least fifty Gladiator's Arena Proofs: Use to consume those fifty Proofs, and create a Runebox: Arena Gladiator Costume (5s cooldown)"
I got 51 of those (Arena Gladiator's Exultation) and it is telling me I must haved at least 50 Arenad Gladiator's Proofs in order to use that, am I missing something or ESO can't calculate math?