Try uninstalling NVDA, restarting the computer, and reinstalling it afterward, too. You may need either Narrator or a portable copy of NVDA to do that.
Which brings up another question, if you generate a portable copy of NVDA from a machine that is not currently misbehaving, does it misbehave on the system that is currently having problems. That's important diagnostic information.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
Always remember others may hate you but those who hate you don't win unless you hate them. And then you destroy yourself.
~ Richard M. Nixon