Related Products not Rotating

Hi all, I have set several items in our store to be related to one another so they will populated below the item the customer is looking at - however when I go to the website there are only like 4 that sync up with one another. 

I have added all of the products to the same Related Products Tag and category. 

https://www.longhearingfarm.org/farmstore/organic-carrots

is there anything else I am missing?