Monthly Training Report

I'm having some trouble with my Monthly Training Report. My report is showing some odd numbers. Now, I know that if a week spans 2 different months only that portion of the week falling on the month being examined will be counted. However, I'm showing odd numbers in the middle of the month. For example. During the week starting July 6th I ran 47.4 miles, but my month report shows that I ran 40. During the week starting July 13th I ran 42.3 miles and the month report agrees. During the week starting July 20th I ran 50.35, but the month report shows 56.65. What's up?