If you are not familiar with this problem try these steps:
1. Go to Visits Report
2. Select Preset "Last Month"
3. Add to a Dashboard
4. Remove the graph
You will only be able to see 28 days of that month, so for October you will be missing 10/29-10/31.
Actually, for Visits you will be missing 10/26-10/31 because of the default "Total Visits" at the top of the report. For Revenue you will be missing 10/29-10/31.