I was going to say Bend wasn't turned on, but it i, You do happen to have a copy of the head in there as well, a duplicate.

Try importing all the body parts into Poser, one by one, open up the Hierarchy window, and parent the bones together in the proper order. Once that is done, click the "Create Figure" at the bottom of the Hierarchy window. Now there's an assembled, boned, and grouped Figure in your "New Figures" folder. Start a new scene (save the one with imported pieces just in case you need to re-do anything, t save time), and load Figure from New Figures folder. You'll now want to assign materials, edit Joint position/rotations if necessary, etc, then save the figure into the folder you plan on storing it. This will now save the figure, and OBJ file to the that folder.

                                                                                                                    

Poser 10

Octane Render

Wings 3D