Voltage meter/electric question

I have a room in my house that has a light switch that controls the top of my outlets. And the bottom of the outlets are constant. Recently everything stopped working.

I used a outlet tester that is reading “hot ground reverse”

I used a multimeter and red to /white= (0), red to green screw= (1.)

This doesn’t make sense to me because we have not had issues in this room and I’m not sure what happened.

At the breaker, the breaker reads black to white (1.)

I guess my question is, that is not what it is supposed to be correct? Why did my ground become a neutral