Twelve hours after posting four jpegs I deleted three from the gallery to see what happens.
The gallery immediately showed only the submarine plug was left but the other three stayed in the above post for ten minutes as the page was refreshed in the browser.
Logged of and then on to find they were also gone from the above post,leaving the sub.
I noticed that if I go back to view albums where images are added or removed then the message “Sorry, the album can’t be found.” persists but only for a finite time.
Conclusion:- The gallery seems to have anti-spam quirks but functions properly.