Bukkit

What steps will reproduce the problem?
1. Enter creative mode with /creative
2. Return to survival mode with /survival

What is the expected output? What do you see instead?
I expect to return to real world, in the same place I left it.
Instead, I'm returning to the world spawn point (not even my bed!)

What version of the product are you using?
I'm using latest version of the plugin, and also these plugins:
AuthMe.jar
Dreamworld_v1.4.jar
GriefPrevention.jar
Permission_Manager.jar
RandomTP.jar
RandomTrees.jar

Do you have an error log of what happened?
No, because there is not an error, but an unexpected behavior

Please provide any additional information below.
I think it might be related to the AuthMe login.