If you meant to attach a graphics, it's not showing.
Photobucket and hotlinking has worked for me.
To upload a graphic, just use the controls below Post A Answer, but be sure that your file is of one of the permitted file types.
Information on how your data is structured would be helpful. Do you have multiple records for each month or just one month?
I'd guess that you are charting the values of summary fields and are sorting by two fields, year and month. That won't work with a chart because the sorted groups have to be sorted on a single field.
If my guesses are correct, define this calculation field, cMonth with Date as the result type:
YourDateField - Day ( YourDateField ) + 1
This computes the date for the first day of the month for the date in YOurDateField. Sort by this single field to get your records correctly grouped by month and year in chronological order.