You need to be careful when importing and exporting the obj file that you keep the vertex order intact, otherwise this exploding thing happens. There should be options you can set to control for this. I use Blender and I always have to remember to do this.

Poser 11 Pro, Windows 10

Auxiliary Apps: Blender 2.79, Vue Complete 2016, Genetica 4 Pro, Gliftex 11 Pro, CorelDraw Suite X6, Comic Life 2, Project Dogwaffle Howler 8, Stitch Witch