Plugin Help Prison ranking per worlds

I'm using the Prison plugin and I have it set up where you can only rankup in the Prison world but I am able to do it in any of the other worlds. I only want it to be available in that world.

Here is what i have:
# Multiworld prohibits players from using prison commands in worlds not listed below.
# It is useful for servers that want to designate certain worlds towards prison.
# To use this feature, set multiworld to true and add the desired worlds in world-list.
multiworld: true
world-list: Prison