@GavinBaumanis Apologies, I’m just now seeing this. You are using the Command Bullet Train, which needs a Powerline patched font to display the prompt train correctly. There is some information on how to do this in the README. Let me know if that helps.
Wow, I totally missed this one too somehow! Grant is right, you just need to install a powerline patched font an then use the settings for your operating system’s terminal to select that font to be used.