Many times switching between characters on the same account, the friends and guild list will not update to the current character. It will show previous characters guild and friends list, and if you click join, it will take you to that person.

This has been a problem particularly in pvp guilds. Someone spies on your guild, switches to enemy guild and then can see who is on, where they are, or join when they shouldn't be able to.

Please fix this bug as finding spies isn't that easy.