Hello,

I inspect your site, your tabs are not clickable, your console display the syntax jquery error about “#deposit&instalment” which is your fourth tab, if you are using any custom CSS, or JS code for tabs then just undo it and check back.
Screenshot for clarification:

If the issue is still there then deactivate all of your third party plugins and clear your site, browser cache and then check your site, This will surely fix the issue.

Best Regards.