Hey Ken,
I checked out jlbdev1.net and was not able to find this instance of a widget like this after a few minutes of searching around on your site. Regardless of that though, unfortunately, there’s very little we can do here. We do not offer support for customizations or for other plugins or themes – here, you mention that your theme is wholly the source of the problem, and that you’re also using another plugin to output the calendar instead of our widget directly.
No hard feelings are meant by this! I was looking around your site to see if I could find the widget, and offer some CSS or at least try and spot the problem for you so you could proceed from there with a better idea of the specific problem – we are happy to help as much as we can.
But we simply don’t know the code of your theme or that other widget-shortcode plugin, so there could be many different things from within those products that is causing this problem on your site.
If this is a disappointing answer Ken, I’m sorry about that. But fortunately, an issue like the one you’re describing could likely be one that just requires a little bit of extra custom CSS to keep things responsive in your theme – reach out to your theme developer, that plugin developer, or any other web developers on your project with you for help. I’m sure you can arrive at some workable solution soon.
Best of luck with your project Ken.
— George