Amount Changed for canceled PO line

We have several POs where a change order was issued to cancel a PO line but the Amount Changed at the schedule level reflects on subsequent change orders. I have attached screenshots that show an example of the issue.

In this example, change order 1 was issued to cancel PO line 54 (nothing had been invoiced or received against this line). Prior to change order 1 being approved/implemented, the Amount Changed at both the line and schedule levels reflect the accurate $ amount for the line being canceled (line 54) (see page 2 of the attached screenshots (highlighted in green)).

On the next change order (change order 2) line 7 was reduced by $1,000. No other changes were made in this change order. Prior to change order 2 being approved/implemented, the Amount Changed at both the line and schedule levels reflect the accurate $ amount for the line being reduced (line 7) (see page 3 of the attached screenshots (highlighted in green)), but change order 2 also shows a negative $ amount for the Amount Changed (schedule level) for line 54 that was canceled on the