Why tab Interactions effect appears only once

According to the tutorial to design, not missing, but the tab Interactions effect appears only once, i dont know why?
I saw this video
http://help.webflow.com/lesson/tab-trigger-interaction#stq=&stp=0

Hi @Tian_Lu, are you talking about preview mode or published site?

Yes, I am a beginner, even completely according to the steps of tutorial video production, but in the preview ,the tab trigger interaction appears only once, the following is my screenshots

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