I was trying to send one mount voucher to two friends and the gem store was bugged. It did not give me confirmation that I had placed an order and didn't take away any gems until suddenly ALL my gems were gone and seems to have sent multiples to one person and then the other person didn't get anything. I don't know if it sent to the wrong person or what. I've contacted support but they told me those people need to delete the item (one had already clicked on them thinking they were a promotional giveaway and the other has not gotten them but they are apparently sitting in some mailbox).
It ate almost 50 dollars in gems because the gem store was bugged. I am incredibly unhappy with this and would like a refund since it was due a bug.