Seems when I export then import the same obj. it’s scale is way off (alot larger) . And that with only using zbrush and no other tool. 
Seems exporting it then importing the mesh, resets it to a state to then …export and import it correctly
I think I read somethere that 3dsmax’s obj exporter may do this. Though I can’t tell right now if thats the case, as this mesh has been exported many times with error free exporters since the orginal max defualt exporter.