I also took a look in the above folder and the date for the last modified So I cannot tell you what the last picture was, sorry about that, anyway I'll upload a screenshot from that screen for you to see what's happening. I've changed the lock-screen picture from Spotlight to PictureĪnd chosen one of those 5 pictures there.
However, there, everything is working fine. It is not an administrator account and is just a regular account with User Group permissions. I have another account which I told in previous posts.