General Deduction Goal Balance

Does anyone specifically know the functionality of the goal balance on a general deduction specifically if a new effective dated row is added to the general deduction panel?

We have an instance where a deduction was coming out as a percentage and part way through the year, the percentage was lowered. We kept the same goal amount and goal balance from the previous row, however when they payroll confirm runs, it appears to lower the goal balance to the total since the effective date and therefore not keeping the running total for the whole deduction.

Is this as expected?