Copy approved requisition to PO - Amounts in line(s) disappear

We are on PT 8.57, PS 9.2 FSCM 41

I am trying to figure out why, at times, the amounts on a line disappear when the requisition is copied to a PO, either through sourcing or copy to PO.

The requisition this most recently happened to, did not have a supplier identified on the line, it was fully approved, budget checked, and had a p-card for payment. When copied to a PO, all the amounts on the line disappeared. This caused the PO to have to go through approval again, as by manually adding the amounts back into the PO, it created a change order.