[NSFW] age gate keeps “turning off”

I would prefer to not link the page that is age gated – especially as I am not sure if the age gate will be working right now- and the very nature of this tells you the link is NSFW. This gallery is supposed to be age gated and is only staying that way for a couple of days. The page itself has the box ticked saying it is gated when I go in to check, all other settings are as they should be, but when a user goes to the page, the box asking for verification may or may not pop up, and the page is definitely not blacking out as it is supposed to consistently. I will tinker with the settings (usually by reversing whether all pages are supposed to be gated and then changing the individual page settings as this site has three individual pages) and get it working again – and be okay for a couple of days – and then check the site and be back to the same nonsense. This is certainly not a “working as intended” sort of thing and I could really use some help getitng a handle on what is going on.

The page I need help with: [log in to see the link]