Break Subtotals not calculating correct numbers in a cross tab report

Hi All,

I have created a cross tab report as seen below and added a break at each Location to calculate the totals.  

However, the sub - totals for each column in the break are not calculating correctly as seen in the screenshot since April 2015.

The formula used for the body of the cross tab is = Sum[Accounts] ForAll [Location] while in the subtotals for each column in the break, the formula is Sum [Accounts].

I am not sure if the formula is incorrect or there is something with the incoming data that is causing the subtotals to be off only since months Apr 2015.

Any help is greatly appreciated.