Stop featured image from double posting on single page post template?

I'm using a child theme of WPMUDEV Blogs Mu theme, of which I'm using the plugin Autoblog to post content, and the addons "image import" and "featured image import". Things are working fine on the main blog page, but when posts are viewed on the single post page template, the featured image is double posted. You can see an example here: Do you have any ideas on how to stop that from happening? Thanks!