nodes – Checkboxes in access panel won’t stay unticked

There’s a page on my website that can’t be made public because the checkboxes in the access panel – when I try to edit the page – won’t stay unticked. I untick the checkboxes and hit save, but when I go back to edit the page again, the checkbox has become ticked again.

Here’s a screenshot to highlight where the issue is. Is there a setting I need to turn off or something?

Screenshot of the checkboxes that won't stay unticked