I found out I had to reset mine as they weren't set from the factory. If you have a new unit there should be a paper included that has your offset values for each probe. I lost mine so i used the boiling water technique. That is, put the probe in boiling water and adjust the offset values until the temp reads 212.
You can verify if they are set using the same boiling water method. Each probe should read 212. If not, it's not set.
-rob