Matt Martinez1,
In addition to Dale's questions, is the calculation option set to "on"? And, so any tasks have an actual start date? If File > Options > Schedule group > Calculation is "off" or tasks have progress (i.e. actual start), those tasks won't move.
Note, even though you are set for auto-scheduling, if you entered any start dates manually, Project will automatically set a "start-no-earlier-than" constraint.
Just curious, all your activities are for last year, so why are do you want to move the schedule back?
John