Greater Quintessence of Hybrid Penetration Bug

I don't know if this is just my client or everyone's client, but I am able to purchase more than three Greater Quintessence of Hybrid Penetration runes. On the PBE, of course. In my attachment, you will see on the right that the "Unlock" button grays out because I already own three of the rune. On the left, I already own four of this quintessence, but the "Unlock" button is still clickable.