Incorrect report after changing the independent contractor..

I am using QB Pro 2007.

I hired technicians as an independent contractor which I paid based on
commission, each technicians are assigned to their Account Manager. So I
assign technician a class as sub class of their respective Account Manager.

One day the Account Manager Mr. AM1 left so I modify his Technicians Mr. T1
from a sub class of Mr. AM1 to a sub class of Mr. NewAC1.

I ran a Profit and Loss Report for Mr. T1 which used to run correctly
showing the Income he generated and the Expenses incurred, however this time
his Expenses never showed up only his Income, which leads to incorrect
statement of what Mr. T1 profitability is.

But when I ran report Profit & Loss by Class, the report shows all the
Income and Expenses of Mr. T1 under Mr. NewAC1 and none shows Mr. T1 when he
was working under Mr. AM1.

Is this a known problem, has there been a fix, or does anybody know what to
do to correct this.

Regards,

Umar.