Category Axis Numbers

I am setting up a chart to graph daily numbers.

This will be used for every month of the year, so am setting the category axis for the numbers one through thirty-one. e.g. 1, 2, 3, ... , 29, 30, 31

The chart is displaying the categories as 1, 2, 3, ... , 19, 2, 2, 2, ... , 3, 31. All numbers display as they should up through 19. However once there is a 2 or 3 in the significant digit the numbers are truncating, except for the 31.

How do I increase the display area for the X-Axis?

You could try reducing the font size.