I haven't done any exporting from Blender to Poser, personally, but it looks like it may not be properly UV-mapped. If that's the case, it's fixable with 3rd party software (UVmapper, I believe) but you'd still need to redo the texture maps, and that's too much trouble for something that's supposed to work "right out of the box". See if you can get a refund.

Or, you could apply procedural (node-based) textures and see if that works.