MacOS log in screen issue after update to 15.7.3

I have an iMac Retina 4k 21.5inch 2019 mac that I just upgraded to MacOs 15.7.3. Since the update when I try to log in the window is shifted 1/2 way down the Mac screen and you can't see the options to change users or enter a password. Help! How do I fix this? I can still log in by just typing the last password used and that user comes up fine, but if for any reason I need to enter the Mac password again we’re back to not being able to see what’s going on because the screen is shifted half way down and the top have of the monitor is just greyed out. So no switching to the account for my other half if they should want to do something on the mac.