Nest Thermostat's range is too wide

My Nest seems to enforce a temperature range of about 2.5 degrees. I live in a tri-level home and would like to set my Nest to exactly 71 degrees or maybe a range of 70.5 to 71.5. Is this possible? Right now, moving the temp up from 70 moves the max temp up past 72. Then moving the max temp down to 71 moves the min temp down past 70.