Strange redirect

I have one blog post that seems to be doing something really odd. When on my main page, and you click on it, it redirects to a nonexistent page. I can see the post on my main page, but when I click on “more” or on the direct link, it goes to the nonexistent page. I’ve checked everything, including my redirect plugin to see if I accidentally added something, but no.

Moreover, if you type the full URL address, it still redirects:

https://www.skepticalraptor.com/skepticalraptorblog.php/vaccinate-flu-to-save-childrens-lives/

As far as I can tell, this is the only one of my articles that has this redirect problem. Strangely, if you click on the comments, it goes to the page in the right manner.