I've set up several redirects on my site using the 'Advanced > Page redirect' option. All have worked absolutely fine up until now; they simply go from a top-level page to one of that page's children.
However, having just enabled this for one more page - the last ordered top-level page (if that makes any difference) - I am now getting redirect loops from every page in the site (excluding the admin interface) to the location that I have just asked to redirect to.
The redirect I've just set up that's doing this is from /contact to /contact/info - so every page is redirecting to /contact/info, including /contact/info itself. What's going on here?