Why are variant pils on my inventory items not working properly?

I have been slowly working on my website to prepare for making it public. recently many of the variant pils on inventory items stopped working. they had been working in the past. when I look at the individual product pages to check for errors, I see that thumbnails are missing. they used to be there. when I try to reload some of them, I am getting a message there is an error with the hs code. the hs code is the same for the products that are working fine and the ones where the pils aren’t working properly. let me say again. the hs code is the same for all of these products and I am getting error messages on some of them. random colors and sizes of the same style. I can’t find any other issue with the items where the variant pils aren’t working. I have not edited the code at all. I am building the dawn 2.0 theme with no modifications. how can I fix this issue?