The tab link fires only once, why?

Question

Bootstrap

https://codepen.io/lumb/pen/ZwqmQj
Standard bootstrap tabs.
Click on the contents of the first tab

<a href="#references" data-toggle="tab" class="small text-muted">Третья вкладка</a>

and see the contents of the third, click on it and again see the contents of the first tab.
And that's it, the transition from the first tab does not work anymore.
I am confused

Answer 1

The issue was resolved like this