Strange lines in OBJ after Importing to Zbrush

[system]

I have just noticed these weird lines in the polygons after importing an OBJ from 3Dsmax2008 to zbrush

I am selecting Quads in the OBJ exporter and using what are stated to be the correct settings

Could smoothing groups be the problem?

Attachments

[system]

here the settings I am using

are these lines in the first image normal?

Attachments