Hi Ron,
I don't know what kind of car you have, but
generally this is a worn pin and/or sloppy teeth problem that allows the back of the hood to walk up. You can grab the back edge of the hood and push up/down to see how much movement you're getting. If you can get a view of the hinge while you do this, you'll see the slop in the teeth mesh allowing the upward movement; worn pins can contribute, but usually it's time for some dental work..

Yes, I'm the hood hinge rebuilder guy..

Rick