Thanks for writing in. That looks like a stray HTML tag and it's most probably caused by optimizations and/or customizations. If you have an optimization plugin that minifies HTML/CSS/JS, please disable it. If you have customizations, please remove all of them for troubleshooting purposes.
If that does not help, we will need to check your back-end setup so we will need you to provide us with WP admin and FTP credentials in a Secure Note. During troubleshooting, we might need to deactivate all third party plugins. If that could not be done in your live site, please duplicate your site to a staging server and give us access to it.