GJ2.6.1 (12/3) wrong owner after change

Hi,
I made a nested group in backend. Because of that I had to change the owner. I made that and refreshed more times. In frontend I have now (see image) a wrong owner in the group description.

How did you change owner? Batch processing or by editing the group and changing the owner? If you used the batch processing at the bottom then edit the group and re-save to see if that resolves the issue.

Hi, it's difficult to reproduce what I made without protocol:
I builded a new nested group as administrator in frontend (new group)
I moved users from the maingroup to the nested group in backend.
Then in frontend I saw, the administrator is owner of the group, I tried to change the owner in backend, but this didn't change,
then I tried to delete in frontend the wrong owner. He is not group user, but in the description of the group he is still there.
This is my official site, so I cannot try a lot.

To change the owner you just change the Owner input to the user id of whoever you want the owner to be while editing the group. Beyond that there's nothing more to do. I'm not sure what workflows you've done to set the owner, but I need exact steps that I can duplicate and properly test.