Bukkit

When you have a worldguard region, that allows players to have their own shop like on our server, and other people are not allowed to build in their shops, whenever they place a shop there with QuickShop, buyers receive the message You are not allowed to do this straight under the Quickshop message of How many items do you want to buy? making it so that buyers think they are not allowed to buy from the shop -.-
Is there a fix for this possible?

Thank you very much!

Remove worldguard or configure your regions and probably other plugins properly. Worldguard is catching the wrong event, or some plugin is throwing a right click event and worldguard is catching that, causing it to spit out its message.

Tldr; not my fault