User has an overhead project where the rates keep coming up at $1.00 instead of $0.00.
This is happening because the overhead project probably has a fee schedule attached, but the fee schedule does not allow zero ($0) rates. You must enable the option, 'Allow zero (0) rates in service fee schedules' in Global Settings > Billing. This allows you to enter zero rates in fee schedules. You can use such a fee schedule to have both the bill and cost rates default to zero, but still keep the entry billable, if required.