Sorry for the issue of the OP. We switched to lot by lot bidding 5+ years ago and this is the first time in several years I have been alerted to an issue.
That said, the language in the rules and FAQ was adjusted after the eBay purchase of goldin, and perhaps to some it became less clear. As a result of this post I have informed my marketing team to be highly explicit and detailed in all the emails that go out in final day and carefully explain extended bidding so that there is no possible misunderstanding on how it works.
I have also linked this thread to the attorneys to see what can be done to ensure there is no possible misinterpretation and bidders like you are not disappointed a lot closed unexpectedly.
Again, sorry for your frustration. Feel free to email me directly
ken@goldin.com