Since yesterday, something may have changed at Notion. We are having an issue with top bar look on mobile devices. Please see attached screenshots. It switches the place of the night vision toggle button and adds three buttons to login to notion.

Your site has the same problem as my site, but some of the showcased sites don't have they also don't have the night/dark button so I guess, that is what causing the issue. Not sure though. Let me know if you have a quick fix for it - like disabling the dark switch button - or if you are aware and working on it.