Problems can arise with products featuring Variants when Print Sizes, Aspect Options or Attributes referenced by an individual Variant are deleted but the Variant itself remains on the product.
In the platform it may appear as though the Variant has defaulted to the next available option but this is misleading. The Variant will in fact still be referencing the deleted option. To correct this, remove the connected Variant option (print size, aspect option or attribute), Save and then re-add the Variant option and save again.
Left unresolved this issue can result in problems with product publishing and thumbnail generation. There is also an associated issue in that products with outdated variant connections return an error, more details below.
A mapping error when duplicating a product is because there is a variant on the Blank product that is referencing either an aspect option, an attribute or a print size that has been deleted.
If the user does not own the Blank product they will need to contact the Fulfiller and notify them that there is an issue with the Variants tied to the Blank.
If the user does own the Blank product, they can export the variants and compare the columns shown below and search for discrepancies.