Important email going to junk folder

Since the newest iOS version (16.3.1) was downloaded on my iPhone i have been having trouble with important emails going in the junk folder instead of my inbox. I checked the email settings on both my apple account and isp email account and I can’t figure out how to fix the problem. I never had this problem until a few days ago. Some of the emails are from my bank and work. How do i fix this?