What seems to be happening is the kilonewtons value is being transferred between kilo newtons to feet for some weird reason(to Feet 
and see attached). But as a note the revit database saves all values in imperial units but the values you see( “As value String”) are how you decided to show units via project units.
As you can see the value in the revit data base is similar to a metre to feet conversion of units but if you can access the “As Value String” you can get the direct value.
This post may be able to help as well CFM and Units, something is awry
