Can't buy guild heirlooms because of guild level req. bug

Hello. On the MoP/Frostwolf server, if a guild is over level 10 (the one I am in is 25) I should be able to purchase heirlooms from the guild vendor that have a requirement guild level of 10, but they are not purchasable, they do not show on the vendor, and on the guild rewards tab they show with a 'lock' icon next to it.

Talking on the global channel, it seems on the alliance side that only one guild has their heirloom purchasing working properly, while other guilds do not, and the GMs tell me that this has been an outstanding bug for a long while now (and with global channel talking about dev favorites, etc.).

I just made revered in the guild I started with, I'd hate to switch guilds just to purchase heirlooms.

If the devs could put some attention to this matter, it would be greatly appreciated. Right now I'm uncomfortable purchasing coins on this realm with this issue.

Thank you in advance for your time and efforts, they are appreciated.