Please note that all subscribers that are added from so called “dynamic lists” are treated as “dynamic subscribers”. That means that they don’t exist for real as a subscribers but as a relation for their properties – Email, First name, Last name, etc. So they are not counted in the statistics and you cannot find them in the count of subscribers per mailing list(s). During sending of a mailing list we check whether we have dynamic relation and we send the mailing list to the corresponding emails.
So for now we don't have tracking statistics for dynamically added users by design.
Please accept my apologies for the caused inconvenience.
the Telerik team