Hi @luvhex,
I think I found the issue. It is in here:
You should map the field from the loop piece not the CSV piece. If the loop set-up is correct, the loop piece should show you 1 item (the first), you need to map the required field from the loop piece. When the loop will run it will map the same field for the other items too.
Please give that a try and let us know the outcome.
KR Bram