@Dustinl, EnergyPlus's default output is in SI units and to get to IP it calls a bunch of conversions. 1 square meter is 10.7639 square feet and if you compare the areas produced in your E+ output vs OS you'll see its a consistent factor of 10.7639. This probably isn't hugely helpful, but it looks like whats happening is that the SI-IP unit conversion is getting called twice in the OpenStudio report. It's may be doing the same with other units too.

That was it, thanks!