Sometimes, WYSIWYG editor have problems. It shows the text correctly while editing, but after saved and viewed in the page, it is not shown correctly.
For example, when using numbered list in the WYSIWYG editor, it is shown correctly in the editor, but after saved, it is shown incorrectly:
That could be solved if editor allows direct HTML edition.
ERPNext: v11.1.56 (version-11)
Frappe Framework: v11.1.52 (version-11)