REST API CO Group Members by CO Group ID returns non-member

A REST API GET to registry/co_group_members.json?cogroupid=

will return a non-member if that person created the CO Group (and so was inintially both a member and an owner) but was subsequently removed as a member and owner.

{'ResponseType': 'CoGroupMembers',
'Version': '1.0',
'CoGroupMembers': [{'Version': None,
'Id': '3516',
'CoGroupId': '204',
'Person':

,
'Member': False,
'Owner': False}]}

Note that both Member and Owner are False.