Profile: Steve Groner

So I have driven on 3 short trips (150 miles each).  I am using the calculated fuel instead of what the gauge shows.  At the end of first trip it shows the amount of fuel used and the gauge reads correctly.  When starting the 2nd trip, the gauge reset back to FULL and calculated from full again.  I did NOT click the Fuel Fill option.  It did the same thing on the 3rd trip.

Any ideas on what may be causing this?