what does the plans and instructions say should be there. Of the 15 or so kits I'v built I've had incedences that were buillt in from -2 to +3 degrees of incedence that was desighned into the model on purpose. Most are 0-1 degree.
Also what are you using to determine this. center of the stabe to center of the stab. center of the wing to center of the wing. My point is if it is a symentrical or even semi semitrical wing ot can appear to be a negative incedence when it is 0. Just a thought