Posts Showing in Wrong Order

Hi everyone!

So I’m having an issues with the site of a client of mine – https://theeducatorsroom.com/blog. This page is set to be the Recent Posts page, but they’re showing in a really odd order. They start at 2014, then go to 2012, then back to 2016. I need them to be in chronological order, with the most recent posts first.

To give you a bit of background about what I’ve tried:

1. Reinstalling my theme.
2. Using the default Twenty Sixteen theme
3. Deactivating all plugins
4. Reinstalling WordPress

This doesn’t happen on my categories pages at all. I did import the posts using WordPress Importer from my client’s previous site, but I don’t think that would have anything to do with it.

I appreciate any and all help you can provide!