Nope. Did some computer virus take your table away? 😷

I use Elementor but I've had no such problem! However, I do have to update it often through the dashboard as "SnazzyIT has said below. Good luck!

I often find that clearing the cache helps.

Laura

Can't help -- don't have Elementor or use a table of contents.

Have you checked for any updates made to your site via your dashboard?