Clicking on Heading Styles dropdown doesn't reflect which heading style is active on a selection of text. It only shows styling for non-styled (standard) paragraphs. Unless we check the HTML it's impossible to determine which style is applied where.
Additionally, instead of a down-arrow next to H, it would be far better to display the style name that is active, with the arrow next to it, much like in Google Docs.
Thanks Patrycja, I've spotted this.
Regards
Alex