Hi, I'm seeing all tabs with green background instead of one at a time with white background.
I can create a temporary login if necessary. Please let me know if you can't diagnose the problem by looking at the CSS.
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Please see the screenshot, there is js errors on your site, this issue is happening when js files loaded on the footer, i can see you also using the minified plugin, can you please disable this and see what’s happening, let me know the result.
Please send me temporary admin access to your site, to this email firstname.lastname@example.org