I'm importing DWG drawings and I've verified that the information on the design layers is the correct size, so I have the units correct (mm), but the Sheet Layer Viewports are at a weird scale and don't fit correctly within the Sheet border.
For instance I end up with a Viewport which should be at 1:100 coming in as 1:96.280 instead.
Have a feeling I've come across this in the past but can't remember how I resolved it. It's quite a few files, with other objects on the Sheets involved, so I don't want to correct them manually if I can help it.