There is a bug with the ZSH al-magic theme. To fix this you need to go into themes/af-magic.zsh-theme and update this line.
-PROMPT='$(virtualenv_prompt_info)$my_gray%n@%m%{$reset_color%}%' +RPROMPT='$(virtualenv_prompt_info)$my_gray%n@%m{$reset_color%}%'
That should fix your theme. The update is in a pull request and should be updated sometime in the near future hopefully.