Im using latest version 2019.3.1 of Stimulsoft. I updated it.
This report is designed in Desktop well:

-------------------
First of all I cant find RtfText component on JS designer.
if I open it JS editor. It seems empty. and on the preview everything render with wrong character results. like this.

So I have learned your side Desktop and JS fully compatible interchangeable, But maybe I cant see this detail.
I cant use my some reports on the web in this case?
Thank you.