Bentley Navigator Measure Volume Issue

I have an Openroads model that contains an IFC element imported via Aecosim. 

It looks great in Openroads and Navigator but there is a discrepancy with the volume of the solid being reported. 

The volume is correct in Openroads. But when I measure it navigator the volume is incorrect. 

Anyone seen this before?

Correct ORD Volume being reported

Incorrect Navigator volume being reported

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