If I click Monthly, it should show me month by month not half yearly
Jan, Feb, Mar and so one
Hourly, Daily and Monthly refer to the time step between each data point, namely time steps of 1 hour, 1 day and 1 month respectively.
So this is not a bug. There’s also a table somewhere below that shows you the numbers displayed as data points in the graph. You can also download the .CSV file and use that to gain insight in your sales/visit data in the exact way that you want.