The latest version of WP has an updated version of jQuery which can run into issues with certain scripts that aren’t ready for it. The ticker script relies on jQuery to run and works as it should with WP 5.6, but if there is another javascript error on your site it can affect/stop the ticker script from running.
I am seeing the following error on your site in the browser developer tools:
Uncaught ReferenceError: jQuery is not defined at (index):568
Which seems to be coming from the following in your html source:
<script type='text/javascript' id='jquery-ui-datepicker-js-after'>
jQuery(document).ready(function(jQuery){jQuery.datepicker.setDefaults({"closeText":"Close","currentText":"Today","monthNames":["January","February","March","April","May","June","July","August","September","October","November","December"],"monthNamesShort":["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],"nextText":"Next","prevText":"Previous","dayNames":["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"],"dayNamesShort":["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],"dayNamesMin":["S","M","T","W","T","F","S"],"dateFormat":"MM d, yy","firstDay":1,"isRTL":false});});
</script>
Please run through the following article to track down the source of the issue. https://www.metaphorcreations.com/article/test-plugin-conflicts/
Be sure to test a default theme as well if plugins do not seem to be the issue.