TinyMCE displays in all subpages but not on home page

Hi, Marco. Thank you for this plugin. It’s outstanding. Unfortunately it displays fine in the footer of all child pages but not my home page.
I use it as a replacement for the Contact widget provided by the White Rock theme my client selected because that theme does not allow any type of map display or link which, these days, of course is an absolute requirement especially for mobile.
Here’s how it should and does look on all pages except the home page:

https://costabravabistro.com/wordpress/about

If you click on Home, it just disappears and when I try to directly edit it from the page, that widget editing bar appears grayed out and does not function.
I’m using the most updated version of Chrome, Windows 8.1, Tiny MCE and White Rock. I updated WordPress to the most recent version Friday morning before I loaded/edited TinyMCE. I did contact theme support and their only response was, “Not sure. Do you have a caching plugin by any chance? It should be visible site-wide” but I don’t know how to check if it’s a caching problem or how to fix that.
Before you respond, be advised that I’m a bit of an idiot.
Thank you very much for any suggestions you might have.