DI-2108 clock time is off?

DI-2108 clock time is off?

I have a simple distance transducer set up with the DI-2108 to measure actuator stroke vs time. When recording data the displayed/recorded data shows quicker than actual rate. (ie. physical actuator stroke time = 5 seconds with stopwatch, WinDaq shows time for stroke =3-4 seconds). Any ideas?