DP creates accounts for guests? (Might be a bug?)

Hi,

I was searching for the keyword "Godaddy" using the search box in "Domain Names" section and it displayed the "matching" threads and members name.
This is an ad that I inserted!
But there were some users being displayed in "grey" as "Guest". Does this mean, DP is showing the guest as members?

And, when I clicked on the greyed out members (guest) names, then DP displays the below error.

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