This is why I don't do this..;)

 I forgot a few things... In export,, you unchecked Universe in export options and rechecked "your Lisa" V4? Then unchecked its 2 global coordinates? Welded? 

Then a default V4 unwelded? Then sculpted Lisa in ZBrush resaved it. Merged it?

THEN, you ran the py script and got that??? Is this what happened?