Hello Sixfoot,
According to the HTML source code, you have two sets of the “ewd-ufaq-faq-list” element on that page, and that is why you are seeing your FAQs twice. Here’s a screenshot for your reference: https://ibb.co/7z7mhwT.
Could you verify that you only have 1 [ultimate-faqs] shortcode or block on that page and see if that makes a difference?
Alternatively, it could be that you set that page for the “FAQ Page” option (in the Basic area of the Settings page) and then also put the shortcode/block on it. Only one of those is necessary.
If the changes are not immediately visible on the front-end, it could be that you have some sort of caching going. If you are using a caching plugin, please clear your cache and then view your page.