Thanks so much for your response, Zed. I’m using version v0.9.6.2 of Fluida.
Here is a screen shot of the blog loading on Chrome, Safari, and Firefox: https://goo.gl/JJeBDE
And you may be on to something with the order in which page elements load. You can see how the whole comment plugin doesn’t load initially: https://goo.gl/Yc7N76
A second later, it loads the complete FB comment plugin, and then you get the situation you can see in the first screen shot.
You can see this all live at photographersedit.com/blog.
Thanks for any suggestions/help you can give!