VersaPlanetary gearbox discrepencies

[ekapalka]

I'm not sure if I'm measuring this wrong or not, but all of the VersaPlanetary gearboxes I've downloaded from Vex are way off from the specs proposed in this PDF. The centre to centre distance between the holes should be 35mm, however the measured distance in Inventor is 35.46350237mm. Additionally, although the implied angle between any three consecutive holes should be 90 degrees, Inventor says its 88.51192648 degrees. The models I'm measuring are this one and this one. Here's a few screenshots for reference. Is inventor screwed up, or is there some issue with the models? Thanks