When visitors engage via any channel UBX Identity match starts to build a profile as they become known. (cookies, device Id, unique account identifier, email, phone,..). The beginning date range of Journey report limits the identifiers shown in individual journeys to events at the start of the Journey. If additional identities are added during the Journey report data range they are not displayed in the report. You can create a new report limiting the Journey start date which will show the added attributes during that period.

What is desired is when new Journey reports are created the latest identities from identity match are displayed for individual journeys