What likely happens is that many domainers unfortunately do not bother deleting their expired or sold domains from their parking accounts, and, most importantly, from sales platforms. At the same time, GoDaddy offers premium listings and auctions domains from various feeds including but not limited to afternic forsale database, and, in general, regged anywhere/anytime and entered into auctions systems by previous domain owners. We once checked godaddy auctions and found a number of domains that we own (some we own for years) were listed under various schemes also including buynow.... not by us. And the same domains were offered on the 1st page of godaddy.
It also appears that many domainers by some reason do not track what they really own, and are "adding" domains they do not own, or no longer own, to various platforms. Resultingly, in the worst case, legitimate current domain owner using the same platform may find domain disappeared from their account, if the platform did not carefully check whois ownership. Our 2 latest cases were domains disappeared from sedo and internettraffic accounts, even though we owned domains in question for a long time
