Update for Clean Business
Is there an updated version of Clean Business? There is a jQuery conflict coming from your Clean Business theme, I checked the changelog of your theme, and it was last updated by its developer last October 25, 2018. There have been lots of WordPress updates this year, especially WordPress 5.
WordPress comes with jQuery included in /wp-includes/js/jquery/ and every theme and plugin should load it from there. My other plugins use WordPress default jQuery while your Clean Business theme's jQuery is outdated, which is causing a conflict. Is it possible to fix this?