Please note that I was able to investigate further your case and note that from 2023 R1 operation field client use with RMA template type will result this.

From 2023 R1 if client use the receipt operation it will be negative / if its issue operation it will be positive quantity, in the screenshot you sent the reason why its negative because, it had used receipt operation, its not  a bug. 

Negative = Receipt operation

Positive  = Issue operation

Please refer below test results and release note for confirmation.

https://acumatica-builds.s3.amazonaws.com/builds/23.1/ReleaseNotes/AcumaticaERP_2023R1_ReleaseNotes_full.pdf

Thank you for sharing your solution with the community @manikantad18!

This question is for @Manikanta Dhulipudi - I have a client and on the RM the operation is “Receipt’, but when we put the quantity to -1 it receives and error that the Qty can’t be less then 0.  We got the Qty to stay -1 and once we hit “Save” the Qty changed to 1.  What could be causing the issue?