Shopify label purchases using billing address, not shipping address


I fulfilled an order (originating on the eBay store, via the official app). The address was incorrect. I edited it before purchasing postage. When I printed the postage, I saw it used the old address. 


I bought another label after voiding that one, and the same thing happened. 


All I can figure out is that it is using the billing address (which has the incorrect ZIP code that the shipping adress had before I edited it). 


Why in the world would it not be using the Shipping Address to buy and address the postage label?


I do not know where to submit bug reports to Shopify, so I am posting here in hopes it gets seen and fixed. 

Monster, creature & cryptozoology patches, buttons & stickers.