DAQ Time Chart

[AeroDesign]

Using LabView 7.0 and DAQ card 6062E, when I run my .vi to acquire and
chart data, the time scale on the chart,which is set at min of 0 and a
max of 3 min. changes to values that are not in that range.  I get:
878276:14:14.60, for example at the beginning and end of the scale.
What can I do to correct this?