Woo Product Gallery, Duplicate Items after Load More

I use the element Woo Product Gallery. When clicking the Load More button, some items will end up displaying again further in the list. I can confirm that there is only one of the item in the Products area.

The duplication can be seen on the unitedpets.us & unitedpets.us/mini-bernedoodle. It doesn’t happen on the main shop page, unitedpets.us/puppies. Seems to only be where the Load More button is used.

The page I need help with: [log in to see the link]