I just zoomed in at 200 % and found things to be quite correct. 02/01 was a sunday and the gridline is set just between the data. Also Feb has had only 29 days and the 03/01 minor top of 2057 lies exactly on the grid. 04/01 is also displayed correctly.
If you zoom in to 400 % it seems that the grids even lie between days 31 and 01.
In any case it should be sufficient, there's no daily map. (Glad about that <g>)
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.