Help Needed – Individual Post Shows Blog Page

EDIT: It is a plugin causing this issue – Custom Permalinks (I’d disabled before, but thought it hadn’t fixed it – on second try, it did). Not sure still why it’s causing this issue for this one particular post, but as this is not a forum related to that plugin, I’ll mark it as resolved.

This issue is stumping me.

Here’s the page/post at issue: https://paleomagazine.com/paleo-chocolate-truffles-recipe/

That post is showing our blog page for some reason. (Compare to https://paleomagazine.com/blog).

For the life of me, I can’t figure out why, but it must be something fairly obvious that I’m missing.

Here’s a list of things I’ve ruled out:

1. No, I don’t have my blog page set to that post/page. My normal blog page (/blog) is still set and working properly.

2. It’s not a plugin – I deactivated all of them and it was still happening.

3. Doesn’t seem to be a caching issue. I not only cleared the caches, but also deactivate the plugins (W3T and Synthesis) that control the caches. I also cleared them when deactivating other plugins.

4. It’s not a redirect. If you visit that page, you can see that the URL stays the same.

We have hundreds of posts, and as far as I can tell, it’s only affecting this particular post, which is baffling me.

Any suggestions/help would be greatly appreciated.