UO Second Age

When using "vendor buy" command on NPC Sharon at the Ocllo mage shop, I received this message:
"Buy Agent Warning: Contains Count 46 Does Not Match ExtInfo 44"

I received the message 3 times when using "vendor buy" command. There was another player there buying items but left. When I returned to the shop a few minutes later, I didn't receive the message.

Thought it was odd and wanted to pass along.

The buy UI counts are only updated when the buy UI is first opened. If another character is there and purchases any of the items while your menu is open, the item count available on the vendor count drops. This leaves an issue where you can request to purchase more of an item than the vendor currently has on stock. This message is normal and just means the count requested was not available.