We made a bunch of downloadable products. First made one, then duplicated it a bunch of times and changed what it links to.
Then for each downloadable product we added all the other downloadable products as "related products" so they show up in the left side-bar.
However only some of them have a checkbox next to them! We've gone through each product and clearly each of them has the exact same values for everything except the SKU and what the downloadable item is that they link to.
Can someone please explain why? Or how to fix this? It seems very random. Thanks.
We're on CE 18.104.22.168, BTW.