Deleting tab removes Active state completely

My tabs are for months of the year. I had January as the active tab and all was good. Today I deleted the January tab. Now none of the tabs have an active state. I would expect the now first tab of February to be active.

As an experiment, I started over with January as active. I then moved the January tab to the middle of the year and when I reloaded the page, the January tab was active. So it appears the first tab that is active remains active. This explains why when it’s deleted, nothing is active. Clicking on any tab will make it active and it will display accordingly. The tab content displays as it should, but there is no indication of the tab itself being active.

It would be nice to have a way to assign active status to a particular tab. Or at least have the first tab in the list to default to active. As it stands now, when the page first loads, there is no way to highlight the tab that is currently being displayed, they all look the same.

The page I need help with: [log in to see the link]