My driver side rear view mirror moves DOWN when I press the Lock. And when I turn on the car...it moves up then moves back down!

I Always adjust it before I drive.

Anyone know what to do? Thanks!

Sounds like your Jeep has the Memory option. It keeps the position of the mirror, radio pre-sets, and I think seat position, and matches them with the corresponding #1 or #2 key fob (used to set them with the button the door) for the current driver.