Product codes / option combinations - only some work

Hi all,

I have a bit of a puzzling problem I’m hoping someone here can help me figure out…

I’m using option combinations to give size/color variations of a product their own unique product code (ie productcode-small, productcode-medium, etc). The strange thing is, only SOME of the product codes appear correctly on the invoice once the order has been submitted. So for example, if I order a medium and a small, the medium will appear correctly on the invoice as “productcode-medium” but the small would only appear as “productcode” (which is the default code for that product) rather than “productcode-small”

If anyone can provide any insight on this it would be greatly appreciated, as it’s got me pretty stumped.

Thanks in advance!