Okay not knowing how you add groups.
Or at least add members to a new group.
There is a field on the main group screen. called posts.
It is for auto promote to a group after x many posts
The disabled ones should be zero."0"
You have several that are null. According to your screenshot.
Plus users set to a 1 post.
I would set them all to a "0" if it were me.

Is not the users group your default registration group?
If you allow guests to post they auto promote to a user group after one post.
Even if they don't register.

If you don't desire a auto promote.
Maybe when you create a group it is adding them without your intervention if it does not have a zero in that field..

But in any case it has always been when adding a member to a new group that they elect to use the new group image.
It should not delete the existing group images they have already.
And there has never been any notification that they have a new image to use.
Now if you change an existing image that works without a member intervention..

Last edited by Ruben; 12/12/2017 5:38 PM.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers