villa@sangham.net joined a group with a QR code, group join protocol finished with “member added” message, but this message was delivered only to other members and not to villa@sangham.net for some reason (message lost by the server, device resetup, …)
Everyone else received “member added” and wrote messages in the chat which are received by villa@sangham.net. Their messages are displayed, but as they are not a member of the group from the point of view of villa@sangham.net, they cannot modify member list.
samana.johann@sangham.net tries to remove and add villa@sangham.net. I think current version of Delta Chat would have recreated the member list and fixed the problem when a “member removed” message is received, but this is probably not the case for the version installed on villa@sangham.net device. “Member added” is then received for villa@sangham.net, but as the device is configured as Villa@sangham.net it is not considered to be an addition of self. This is a bug I am going to fix.
It seems to be repeatedly the case. It happens after a not "member sends from another device’, of which could be only really a matter if somebody else got known her pw.
Maybe a related issue for this case: eg.: get one’s chats back after having changed pw., maybe.