So this is happening on mobile since the new responsive layout was rolled out!
It’s been happening with iPad Safari for as long as I can remember. I’m so used to it I muscle memory twist to landscape without giving it a thought.
Because it isn’t something non-staff would encounter, I think of it as low priority. Yet if there is an easy fix I won’t complain.
Fixed - along with a couple of other things on that page - via:
Thanks for reporting @itsbhanusharma