It's not really a problem, I'm just curious. Why do I need to give the seller my address if I'm buying something that doesn't need to be shipped (i.e. downloads) or when I donate money to someone? Or they don't see that information and it's just in my log and receipt?
For example, on a receipt for a Steam game there is shipping address, but one time I downloaded music from bandcamp there wasn't any. Furthermore, one time I made a donation my address wasn't mentioned anywhere on the receipt, but the other time (donation to a different PayPal address) my address appeared on the receipt. It wasn't under "donation details" section, but below it, under "your unconfirmed address".
I searched through PayPal's help and FAQs, but I wasn't able to find any useful information.