Debit invoices are raised on the 10th of the following month but issue-dated to the last day of the month they relate to, so the debit lands in your accounts in the right period.
Debit invoices are raised on the 10th of the following month, but the invoice issue date is set to the last day of the month the variance relates to. So your March debit invoice is issue-dated 31 March, even though it's raised on 10 April.
We do this so that the debit lands in your accounts in the same period the underlying payroll occurred. If you're matching invoices to specific reporting periods, this alignment makes accounting cleaner.
If your finance team flags this as unusual, the explanation is: the issue date reflects when the variance occurred, not when the invoice was raised.