Tabs not working !

https://www.prixelmedia.com/nailspot/test-orali/

I am using the free version. I made 2 tabs, but once I change to the second tab, cant change back to the old tab. i.e 1st tab – Introduction; 2nd tab Ingredients. The Introduction is active on loading, but when i choose ingredients and try to come back to introduction tab it does not work. please i need a fix for this