Hi Anna
What are the SID's of your 3 systems ( DEV , QA and PROD ) ?
Also when you are logged into the OS Level of your PROD system , can you go under the /usr/sap/trans/data and /usr/sap/trans/cofiles folder and see the owner and group for the transports.
Ideally , the group should be sapsys and which should be the primary group of the <PROD_SID>adm user.
Thanks
Rishi