Hello 🙂
Sorry to hear about the troubles. I visited the link provided and experienced the issue described. You are more than likely experiencing a theme conflict. Please read through our Themer’s Guide on how to successfully overwrite your single-event.php template.
One tip I can provide off the bat would be to open “Inspect” by right-clicking your mouse when viewing an event page and see if you can track down the repeating code.
I hope this information helps and best of luck with the template override. Have a great week!