double posts on 1 post, permalinks

In reference to: https://www.giftsgadgetsandmorestore.com/?p=1268

If you look at the page, you will see that an excerpt and image set within a slider frame, along with price tags appears above the real post. This is consistent through all posts.

I noticed when I use custom permalinks, nothing shows up on the post entry. So I changed the permalink back to default. I’m not sure if the two issues are related.

In any case, how can I get rid of the excerpts and just keep the intended posts? Many thanks.