Open up you Aircraft.cfg file, after making a backup copy! Look in the [weight and balance], [fuel], and [General Engine] sections. You may have an imbalance side to side in one of those someplace. the Latitudinal (left/right) number is normally the second in the sequence after the longitudinal one, and the weight or number value.
in the [weight_and_balance] section...
weight long Lat vert
station_load.2=00245.00, 18.00, 0.00, 4.00 // 1 Pilot
Please note that the [fuel] section the unusable gallons in the tank is the last number, preceeded by the usable gallons, the vert, lat, long numbers, in that order, right to left.
Look thru those sections for an lat imbalance someplace. It may or may NOT be the problem, but i've seen it before....
Hope that helps!
Have fun, fly high, far, and free!
2S7, Chiloquin OR