When used in Logger Pro, there is an issue in the LabQuest DAQ (data acquisition) firmware whereby live readouts and autoID functions interfere. The symptom is a discrepancy between live readout values, and what is seen after starting data collection.
The effect varies by sensor and is very noticeable with a pH sensor. Live readouts will show a noisy value that is from several tenths to several pH units high. Once data collection starts, the values will be consistent from reading-to-reading, but they will be different from the live readout value. The recorded values are the correct values.