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There can be more members than followers in private/secret groups, but definitely not the other way
This can happen only if there was a open group which was then changed to private one.
We had similar situation where we had more followers than members.
And those extra followers could not unfollow the group as they had no access to the group.
So they continued getting notifications but could not access it.
We then realised all these groups with such an issue were open groups, which were changed to secret / private for some reason by their owners.