I then decided to check and make sure the breakers were good. I used a
voltmeter to test the output on each breaker and they all came out at
122 volts. At this point, I am at a loss as to where to look. This
seems really strange. I haven't been working on any wiring projects
and the house isn't that old and doesn't have any aluminum wiring.

Do you have any outside outlets? They'll have GFCI breakers as well.