Sanjeet Mourya Greeting & Welcome to Microsoft Q&A forum!
I'am using azure ai content safety for image sensivity from the last 1 month it was working fine but today i found some of image result was not as expected, like i have sample.jpg image which severity level is 2 as hatefull content before, but today i got severity level 0 for same image.
Did you change the severity level? You can adjust the match severity levels and see if that solves the issue.
Also, see Best practices to improve accuracy for more details.