@xerxes1,I have tested the RichText editor with all enabled features, and have no headings (h2,h3,h3) selected. On AEM 6.5, Everything is working as expected here. You can find my the component that I have tested here, https://gist.github.com/briankasingli/1a7e3e12deaa2e076645b09d30039b46Take a look...