Conditional field issue

This sounds like a theme related issue. Have you tried switching to the default theme? Also, you should check your JavaScript console for errors: https://webmasters.stackexchange.com/questions/8525/how-to-open-the-javascript-console-in-different-browsers

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Yes you are right, its a theme related issue. But how do I resolve it since changing my theme isnt an option. Please see link https://www.obhanandassociates.com/india-patent-fee-calculator/

Also there aren’t any javascript errors in the console.

It seems to be a conflict with W3 total cache and not my theme. Please could you help fix this.