Rearranging Printify variants not working

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Using the Printify app (and yes, I've double checked the settings in Printify plus republished the product), I've tried to rearrange the sizes so that they're in more logical order - Small, Medium, Large, XL, etc. No matter what I do on this one product, the Large size is consistently at the end of the size variant. I've gone into Shopify's options in the product page to Rearrange Variants, dragged the Large where it needs to be, saved, and returned to the product page. Nothing has changed. Suggestions please on how to make this stick? Thanks.