Hi there,
This seems to be related to your customization. I added a new page on your website and added the Classic Raw Content element and add the shortcode of the 10 tabs below:
[x_tab_nav type="five-up" float="top"]
[x_tab_nav_item title="Tab 1" active="true"]
[x_tab_nav_item title="Tab 2" active="false"]
[x_tab_nav_item title="Tab 3" active="false"]
[x_tab_nav_item title="Tab 4" active="false"]
[x_tab_nav_item title="Tab 5" active="false"]
[x_tab_nav_item title="Tab 6" active="false"]
[x_tab_nav_item title="Tab 7" active="false"]
[x_tab_nav_item title="Tab 8" active="false"]
[x_tab_nav_item title="Tab 9" active="false"]
[x_tab_nav_item title="Tab 10" active="false"]
[/x_tab_nav]
[x_tabs]
[x_tab active="true"]tab 1 content[/x_tab]
[x_tab active="false"]tab 2 content[/x_tab]
[x_tab active="false"]tab 3 content[/x_tab]
[x_tab active="false"]tab 4 content[/x_tab]
[x_tab active="false"]tab 5 content[/x_tab]
[x_tab active="false"]tab 6 content[/x_tab]
[x_tab active="false"]tab 7 content[/x_tab]
[x_tab active="false"]tab 8 content[/x_tab]
[x_tab active="false"]tab 9 content[/x_tab]
[x_tab active="false"]tab 10 content[/x_tab]
[/x_tabs]
I checked the page and it is working ok. So you either need to recreate the tabs or see what is the difference between the original and your customized version to find the problem.
Also please do your tests in an isolated environment. Add your tab code to a new page and test so that you will be sure that the tab code is the problem not the other parts of the page.
Thank you.