Pages appear in admin, but frontend shows 404 not found error

Hi all, I have a site which I’m trying to debug, which is using the Broken Link Checker plugin to check for bad links. Upon checking, the site reports 41 broken (inner) links: the problem is that the relevant pages exist and show up on the admin side with its content (and the permalink is correct and is also set correctly in Settings > Permalinks) but when I preview the page or try to access it from the frontend it gives a 404 error.

I’ve tried to regenerate the permalinks, access the page through its shortlink, nothing.

Site URL: https://www.arcticspascore.com/
Problem link example: https://www.arcticspascore.com/hot-tubs/features/

Any ideas on what I should do to solve this?