All H2s are in upper case

I just noticed that all of my H2s are in upper case. You don’t see the upper case in the WP editor, you only see this in the published blog post. Is this a All in One SEO issue? I noticed this after I made some fairly low key changes to AIOSEO, none seem related to this issue. Has anyone seen this before?

You can see an example here (the all upper case sentence is the H2)