Specific WordPress permalinks link to wrong page

I have a somewhat strange issue with WordPress today. This behaviour has only begun in the last week or so as far as I can ascertain.

Any page with the slug "downloads" links to it's parent page instead of to it's own page.

I have tried the following:

1. Reset permalinks to default and then back to %postname%
2. Disabled all plugins
3. Physically cleared the cache

But none of the above fix the issue. The weird thing is that this behaviour is only happening for pages with the slug "downloads". For all other slugs it is fine.

For example there are multiple instances of the slug "get-involved" with different parents and all work fine. But when the same is done with "downloads" the links redirect to their parent. Is anyone else experiencing this issue?

I have also verified in fiddler that the pages are not redirecting, they are actually linking to the parent page with a response code of 200, there is no 301 or 302 thrown.

via Chebli Mohamed