It seems your website have javascript errors caused by other plugins/theme:
Uncaught TypeError: $this.$bkcontainer.find(…).dropdown is not a function
at Object.sec_menu_cfg (page-builder.js:257)
at Object.run_cfg (page-builder.js:153)
at HTMLDocument.<anonymous> (page-builder.js:877)
at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.2.5:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.2.5:2)
at Function.ready (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.2.5:2)
at HTMLDocument.J (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,moxiejs,plupload&ver=5.2.5:2)
You can find and resolve them by following this guide. Once these javascript errors are fixed, eventon scripts will be able to run properly and will resolve your issue.