Tabs flew off in the WOO topic - what to do?

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Edited ONLY CSS (PHP touched, but restored to default version) Playtest.tmweb.ru/vafelnoe-polotno/vafelnoe-polotn... tabs flew off in this topic (when you click on the tabs, one should be hidden, and the other one should appear) In the demo it is - demo.woothemes.com/?name=artificer&_ga=1.165828670...
I didn't catch the moment when it happened. But I guarantee that I didn’t touch JS (I don’t exclude that it was like that from the beginning)