If you edit any plane in G2 and check the value of wing loading you'll see is wrong ,either full or empty.
As they said, wing loading is weight divided by wing area, but the results given dont match.
Is that right ?

Not sure if this is the answer you are looking for, but I have found that when I edit a plane in G2, once I have edited any parameter, I need to edit all the other paramaters as well to make the plane correct.

For example, if you edit a plane and increase the wing span by 10cm, you will then need to increase the weight by so many grams to account for the extra size. And then that leads to going through all the parameters to adjust for the first 'edit' that was made.

I hope this makes sense...

I mean just editing any G2 plane without modifying any values