When exporting a variable font from Glyphs app with masters that have the custom parameter “Axis Location” it is understood the the fonts axis and instances are scaled to these new minimum and maximum values. This occurs properly on the fvar table but not on the STAT table, the STAT table uses the unscaled values
As an example: if Regular has a weight of 95 in Glyphs, with an axis location of 400, the fvar table will properly display 400.0, but the STAT table shows 95)