Transformations can be applied to both groups and their objects. Check to ensure all transformations are set to 0 in Marmoset Toolbag. Because transformation information is stored with the object reference (afaik) , reimporting will not correct the problem, either try deleting everything and the reimporting it, or fixing…
The transforms are all set to 0 in Marmoset. I also went back to Blender and checked that all the transforms were applied correctly and they were. Unless I misunderstood what Transformations in Marmoset means?