Jigoshop Products Are Showing as Posts on Shop Page

I use the Jigoshop eCommerce plugin, which has been very compatible with the Skeleton theme. After I recently updated WordPress, all of the Jigoshop products on our shop page are showing as posts, instead of products with an add to cart button, price, etc., and the posts do not have a thumbnail picture. This problem appears to be isolated to the Skeleton theme. The products do show correctly in the Jigoshop shortcode, though.

It used to show the products like this:
https://simplebeadpatterns.com/new-tutorials/

Now, it looks like this:
https://simplebeadpatterns.com/shop-3/.

When I use the Jigoshop Product Search widget, they are all coming up as posts as well.

I am really hoping that there is a way to make the products not appear as posts. If not, are you able to tell me how to have the thumbnail image show? I found the Sample Blog page on the Skeleton website with the thumbnail image for each post. I have a featured image set for each product, but there is still no image.

Skeleton’s Sample Blog page with thumbnail images:
https://themes.simplethemes.com/skeleton/news/

I really hope you can help me with this (fingers crossed!) Thank you so much!