"null null" displayed for anonymous user in Edit project > users

On syscid map and pg-sandbox in Edit project > Users it happened that for anonymous there is null name and null surname displayed instead of nothing. What is interesting for other users with no name/surname, null null is not displayed. Also, on syscid-map, after I overwrote details of anonymous null null disappeared. On pg-sandbox it is still visible.

In USERS the name/surname of anonymous are empty (no null).

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