Blog post not rendering correctly

We’re trying to add a fourth post to our Fastpages blog (blog.pslmodels.org). The first three worked fine, and this one is equivalent as far as I can tell, but it’s not rendering correctly, both in the TOC (wrong title) and the main page. Here’s the code and PR. Any ideas what we might be doing wrong? Thanks.

TOC:

Post:

The issue was a space before the --- closing the front matter.