Unable to close a short sell position in Fidelity even after buying the the stock

I performed a SHORT SELL for MRNA stock sometime back and then performed a BUY to cover the SHORT. Even after many days of buying the stock I still see the SHORT position in my Fidelity portfolio. I performed both SHORT and BUY in Margin account. Has someone faced this issue or can suggest a solution for this?
Just in case if it helps further clarify the situation. I already had some stock of MRNA when I did a SHORT SELL.
Thanks in advance!