have narrowed the problem down. The material I apply in Ts is tiled to cover the whole object. I assumed that it would export the same, but when I look at the preview in Poseray, the individual tile is stretched to cover the whole object.
I am going to try generating a tiled material to fit the whole object, however it seems like an unnecessary complication.
As usual the fix is probably simple, but I haven't figured it out.