If you noticed that the quantities of your variation listings are not syncing correctly and you receive following error in the inventory feeds: “quantity must be consistent across all products” you may need to follow these steps to fix it:
Select the affected product in Etsy and click on “Edit quantity options” next to the Quantity section.
In this section you must select the “Quantities Vary” box for all possible variation types.
Please keep in mind that this has to be done for any Etsy listing you have with multiple variants.