I noticed what could be an issue in loading the emoji script. If you go to the speed test below and look at the very last two lines you will see where it tries to load this script:

https://www.celiac.com/index.php?app=core&module=system&controller=editor&do=emoji&csrfKey=772d07c25eeaaf650059567807fd5a7b

which fails the first time, then it loads the 2nd time (scroll to the last two resources loaded):

https://tools.pingdom.com/#!/ezM9h6/https://www.celiac.com/articles.html/gluten-free-travel/gluten-free-travel-to-nassau-bahamas-r1722/

I am just wondering if there could be an issue with this, as I don't believe this should happen.

I've done several experiments with your html file on my server. I have an idea which element is causing this error. I sent you my hypothesis to PM.