Need help with groups

Hello, so i am trying to add more donation ranks to my server, but everytime i add the new groups, the player has the prefix and the group name that they are in. Or sometimes they have 2 of the same prefixes, when i only want the prefix!

The image shows me having the group prefix and the name of the group when i only want the prefix.
Here are my Groups http://pastebin.com/vFubyFw0
Thank you

 

What is your chat plugin? looks like you want to modify its format.

 

Towny Chat
I found how to fix it, thanks. But do my perms look good?

 

eatingtoejam You should make use of inheritance inorder to avoid having to give the same permissions over and over again. Inheriting a group means you get all its permissions.
Your owner group is also inheriting non-existant groups.