The temperature on the Puck may be slightly different than the Temperature displayed in the Flair app.
The temperature displayed in the Flair app will shows the average room temperature of all temperature sensors in the room over the last 5 minutes.
A Sensor Puck updates when there is a 2F degree difference in room temperature and a Gateway Puck updates when there is a 1F degree difference in room temperature. These update mechanisms are designed for conservative usage of Flair servers. Most smart-home products operate in this manner.
If you're looking for exact temperatures, view the statistics. These update every 10 seconds. To view statistics for your entire home, tap the Flair menu and select "Home Statistics". To view statistics for a specific room, tap the 3-dot menu on the room tile and select "stats".
If the temperature on the Puck does not represent the actual room temperature, you can calibrate the Puck. The best way to verify accurate room temperature is by comparing the Puck temperature with at least two separate temperature reading devices. If you're only comparing the Puck temperature with one temperature reading device, it's hard to say which one is accurate.