On your HD find the pose you applied and open it in text editor (should be in yor poser/runtime/libraries/pose/..... the file will have the same name which you can see under the thumbnail in POser + extension pz2 = filename.pz2)

Then (inside editor) look for the actor (bodypart) which gives the problem - the names are not exactly the same like for real human.

When you find it look for lines with: translateX, translateY, translateZ - normally they shouldn't be there but like pjz99 said they can. In case you find them then just remove or make them 0.