Sorry it’s been a long wait for you. Here is what works for me when you have multiple tabs in a page ( learnt it today since I did not have anyone raise this issue so far ) –
Wrap the [tabgroup] shortcode with a div and you should see the right behavior. Hence, I went ahead and edited your page to wrap the two tabgroups with a extra div each like this –
[tabgroup] .... [/tabgroup][tabgroup] .... [/tabgroup]
That id on the div is not really required (you can use a common class as well) but I just put it there to separate out the two tabs. Both tabs should be functional now on your site. Pls check and get back to me if you have any queries. Thanks