Your theme and the problem are different, even though the outcome is the same. Always best to start a new thread. Anyway…
It looks like the design-2 page has not been setup in the usual manner. Have you used two shortcodes? It will be difficult to get it to work like that.
The way to do it is to go to Admin page > Products > Categories and set up a category called “design”. Go to each product page and set the product category to “design”. The url for your category page will be:
https://jelsboutique.com/product-category/design/
The exact form may vary depending on your permalink settings.
If you have trouble getting the correct category page url, at WooCommerce > Settings > General tab > Display, set the shop page to show “Categories” (not products). Your shop page will now show the single entry for the design category, and it is this url that you need to capture for use in your menu.
The items on the category page should then appear side by side as they do in your shop page at the moment. We may need to tweak the margins but we need to get the page structure right first.