In a case of mistaken identity, WordPress has been updating users of AppThemes’ Vantage to SiteOrigin’s Vantage. This is a very unfortunate side effect of how the WordPress updates system works.
First, let’s take a look at how the WordPress updates system works. WordPress uses the theme slug as the identifier for a theme. A theme slug essentially a theme’s folder name. Because both our theme and AppThemes’ theme share a theme slug, WordPress mistakenly assumes they’re the same theme and tries to update both of them from the WordPress.org directory.