The issue of disappearing photos is that early in the development of V11 Lemans, they didn't host the photos themselves. They merely displayed photos that were hosted on other websites. This saved on the data V11Lemans had to carry, and made it easier for the site overall. The downside is that when a hosting website (like Flickr, photobucket, etc) has a lapse (user account is lost, site shuts down, etc) then the pic is off the web and off V11Lemans.
It looks like currently V11Lemans is hosting the photos themselves, so the "disappearing photos" issue should stop for the new stuff.
As an aside, I'm the webmaster for the Italian Motorcycle Owner's Club (IMOC) https://www.imoc.website/