Broken behavior in mailman module

Using Virtualmin Pro 5.07 on Centos 7 with Authentic Theme 18.40

When I use Firefox (or Chrome or MS Edge) on Windows 10, log in to virtualmin and

1) go to Services | Mailing Lists on a virtual server with mailing lists 2) click the manage button beside a mailinglist name and 3) log in the Mailman web interface that appears I get to the Mailman mailing list administration for the mailing list.

If I then click the "Membership Management option" the correct mailman page (which is the Membership List subitem of the Membership Management option) appears but something scrolls it to the very bottom and prevents me from scrolling back up to see the top of the page. I can only see the whole page if I use the browser's zoom out function (Firefox) until the entire page is visible. When I then click on the Mass Subscription or Mass removal option under Membership Management those pages load without this improper scrolling behavior.

I notice that when the Membership Management | Membership List page loads and is being then forcibly scrolled down), the following javascript error appears in the console:

Unrecognized expression: #aatest%40example.com_unsub  bundle.min.js:2:13803

"aatest@example.com" is the first email address in the list of subscribers that appears on this page.

Also, when I zoom the Membership List page out, make no changes on it, and then click any other option in the menu at the top of the page, a javascript box comes up saying "This page is asking you to confirm that you want to leave - data you have entered may not be saved." with options of "Leave Page" and "Stay on Page"

This behavior does not occur if I switch to the Virtualmin Framed theme.