Bukkit

What steps will reproduce the problem?
1. Install RaC and MultiWorld
2. Set your class to have a movement speed modifier on it
3. Apply that class to yourself
4. Create a second world using MultiWorld and load it up
5. Warp into that world

OR

1. Install RaC
2. Set your class to have a movement speed modifier on it
3. Apply that class to yourself
4. Create a warp somewhere distant from yourself
5. Warp to that warp

What is the expected output? What do you see instead?
The expected output would be that the movement speed buff stays with you, however, the buff sometimes will remove itself while the rest of your class buffs will stay with you.

What version of RacesAndClasses are you using?
1.1.6

What version of Bukkit / what distribution are you using (Craftbukkit, Spigot, Cauldron, ...)?
Craftbukkit 1.8.7

Do you have an error log of what happened?
Nope, no errors come up in the console upon this happening

Please provide any additional information below.
This issue doesn't occur 100% of the time, but when it does it permanently removes the movement speed buff any class involved has until the player changes their class to something else and then back again.