Annual leave not updating for new employees

Hi there

We have a set date for annual leave entitlements at 10th December 2020 for all employees.  Now that we are past this date MYOB is asking me to update balance but it does not update any new employees who started after November last year. Their balance just goes back to zero with no leave due and nothing accrued.  There is accrued hours before I update though and then after the update it disappears and goes back to zero?  Any help would be greatly aprreciated.