Black Lion Keys - one choice ?

It's not on purpose, I promise! We're working on it:

@Parasite.5389 Can you elaborate a bit? I did a quick check with the team and they haven't received any reports.

Okay, I'm pretty sure I know what this is--the statuette vendors now take into account if you already own a cosmetic or novelty item and will not display it, in order to avoid accidental duplicate purchases. We are currently talking about making that clearer so it doesn't look like something is broken to players who already unlocked everything in certain tabs.

This is resolved! You should see all purchasing options for keys in the BLTC now. Of course! Our Customer Support team is ready to help you with that, please reach out to them at https://help.guildwars2.com/hc/requests/new (cc @Drako.8295)