Leave Entitlements not Reducing based on hours worked

I'm running my first payroll in Accountright 2019. In V19, when you entered the Base hours, the leave accruals would automatically adjust. If the employee is not being paid for time off, then leave doesn't accrue for that period, and in V19, the entitlements would calculate themselves depending on the base hours worked. I have one pay where instead of 38 hrs this week, he only worked 15.2 and the entitlements remain at 2.923 and 1.462 when they should be reduced. Can you please advise why this is happening and what I need to do to fix it. Thanks in advance Mary