Production order settlement occurs in 2 periods?

Hello friends,

Kindly, can you please help me understand why a production order settlement would occur in 2 separate periods. For example, I have an order that was settled for April that resulted in over-absorption. When I settle production orders the next month in May, this same order number is setlled with a resulting under-absorption. So I realize that for this April order, the settlement should have taken the net of both of those absorption variances. Why is the settlement out of alignment?

Thank you!

Jonathan