Be sure you select the correct projection, according to your model (image). Also, be sure that you have front view activated, not back view, in sketchup viewport. If green axis is with dotted part towards you, is OK. But if the dotted line is pointing at the horizon, you are looking to your model from back and that can explain why you are seeing the model that way.
[image: YUBT_2010-12-16_144322.png]