Not quite a bug, but intuitively, I assumed that when opening the due date panel, I could:
1. immediatly start typing the date
2. press enter once to choose
3. press enter again to confirm/close the panel.
It doesn't close the panel (#3) when 'enter'ing again
Also, there's a teeny tiny lag when typing, for example, Today, and then being able to choose it (#2), so I click enter twice to select(because it hasn't loaded untilt he second click)- but then again, I'm a fast typer.