m+ Face Area giving double area

hi all,

I was using the m+FaceArea component to get area of faces for a weighted avg calculation. For curved planar surfaces (200m2 - 1000m2) it was taking a lot of time, grid size 0.1m. takes a few mins sometimes.

I used the honeybee generate test points component just now and it is 100 times faster. BUT what I noticed is that the m+ component gives double area for each face. Can someone double check on this? Is it a bug? if yes then I have done a lot of calculations wrong in the past :P As long as weighted avg is concerned it would have been still okay though. 

Thanks