Hey Jeff,
Please keep in mind that a blog index is an archive page. You do not need a Looper Provider in it. What you have right now is actual a normal page.
You haven’t even assign your Blog page as your Post Page in Settings > Reading. To fix your issue, do the following:
1.) Edit your Blog page in Cornerstone and save it as a template.
2.) Go to Settings > Reading and assign the “Blog” as your Post Page
3.) In Cornerstone, create a new custom Archive layout and use the saved template.
4.) Disable the Looper Provider in your archive layout.
5.) Add the Post Pagination element to your layout.
Kindly let us know how it goes.