I'm updating an old site, replacing the now-discontinued "Toolset Starter" theme with GeneratePress. I've updated all the plugins, and set it to use Bootstrap 4. The one problem I'm having is that while it displays the initial/default tab content, the first tab does not appear in the selected state.
For example, compare the current site : hidden link
To the new development version : hidden link
Why isn't the Radio Shows tab appearing as active? What can I try to resolve it?