Double Colon on World Creation Screen

The world creation screen has a double colon, "::", on the Game Mode button.

What I expected to happen was...:
It's supposed to be a single colon - :

What actually happened was...:
It's a double colon - ::

Steps to Reproduce:
1. Go to the "Create New World" screen
2. Look at the "Game Mode" button. It will be there.