Calendar randomly displays vertical list not the grid. Why?? Nothing has changed here, programmers need to create a "sandbox" to play in...
I'm not able to recreate this in Chorme. Are you on desktop/computer or mobile? Browser? Can you post screenshots of what you are seeing, please?
The calendar layout automatically switches to a list if you make the browser window very narrow, because showing the grid layout on small (mobile) screens isn't possible. So just make the window a bit wider and it'll be back to normal :)