I think your whole model is very large, and, as Transpose has a limit of influence, this is causing the problem. (Apparently some ZB2 meshes can be large when brought in to ZB3.)
Back up your model first to be sure of recovery should something go wrong. If you have only one object [no subtools] then you can press Deformation>Unify to scale the object. Do not use Unify when you have subtools, as the scaling will not be uniform; instead use the Deformation>Size slider to scale down by the same amount for each subtool. I suggest you input -50 from the keyboard and then repeat this if necessary. Note that if you put in -100 your mesh will disappear, never to be seen again!
Edit: reducing the scale of your mesh should increase the responsiveness of the offset slider. 
HTH,