Revit :: DB Link Inconsistent Values?

ive recently started to work with DBLink and access 2013 to make take offs mainly. Today i made a small project to test some ideas and found an inconsistency between the material areas and the area of the element, a wall in this case, to which the material is apllied. I think they should be the same, or at least very close, but that´s not the case when i export to access. I've attached a image with a material takeoff schedule from revit and the correspondent query from access (element type name, element area, material name, material area, material volume, material area/element area). The revit one seems correct, but in access the material area values are very different. Initially i thought it would be due to units difference, like the material area were in sq cm and the element area in sq m, but the relationship between them isn´t 10, as you can see in the calculated value. Then i added the material volume to the schedule and query and the results on access are even more strange, i can´t even imagine where this values came from.

I´m using revit architecture 2012