Why is my event double posting?

This concerns Events+, specifically the single event template. Whenever an event is viewed on the single event view page, it is posted twice. I have the settings configured to use the single event template "plugin: calendar" that comes with the plugin. The other options are "default" and "full width" which appear to be working fine. I'm anticipating that this might be a theme issue on my side, though unclear why the single event template would get screwed up with only one of the three onboard options if this is the case.