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Need help with mobile navigation using Tabs

I have a site i created for a customer earlier this year using tabs within the navigation. It all worked great when completed but a couple months ago it started closing the mobile nav when clicking on a tab in services dropdown. problem is only in mobile view. Desktop works great.

Can someone help with a solutiuon?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)