Hello there,
Thank you for letting me know of this.
In your case, there is a heading depth gap from H2 to H4, your tree looks like this:
For best results, it is recommanded not to skip a heading depth between a parent and a child. Ideally there should not be a jump from H2 to H4, but from H2 to H3 instead.
However, Joli TOC has built-in mechanism to try to correct malformed heading trees and deal with “hidden headings”, but sometimes it can give unwanted results.
Nevertheless, I already have identified the issue you pointed out and I have already a fix for that. It will be deployed in the next update (coming soon).
If you don’t wanna wait, please send a message at [email protected] and I’ll give you directions so that you can modify the code directly on your install.