Report not picking up correct amount.

[Venus]

I have a report that runs fine on every computer except one.
Its the same mdb on each machine but only on one machine it does not pick up
the correct amount. I'm completely confused why????
Below are the fields:

TextBox
Name = [CommPaidOnAmount]
Control Source = [CommPaidOnAmt] (This does not print the correct amount on
only one machine)

TextBox
Name [CommPaidOnAmt]
Control Source = [LineAmount] (which is a running sum)