Well, if the referrer listing is blank, there isn't much you can do; as the WoL system just parses the spider data based on what is being supplied by bots IN the referrer variable.
The referrer listing is blank on all the Search Spider entries, and is blank on all the bingbot "guest" entries. So I don't understand ho the referrer being blank causes it to show up in the guest area.
I do appreciate your taking the time to post in this dialog. I am mostly a "grasshopper" here.