Case Last Updated date changed with no status change

My initial dropbox appointment was on jan 24, 2023. On Feb 2, 2023 ceac status changed to Refused and I was given 221G to submit more documents. I submitted documents on Feb 9th, 2023 except passport. Today case last update date was updated to March 8, 2023 but the status is still Refused. What could be the reason?