ZBrush modelling mess up

After I learnt how to create ZSpheres and apply I adaptive skin, I started working on the main body of my nature sprite. This started out really well and I was getting the exact shape I needed and I hoped once is was finished I would be able to start sculpting into this. Unfortunately when the body shape was finished I noticed that the symmetry was no longer central and had gone off to one side. When I first made this error I had no clue what I had done and was incredibly frustrated that I had to redo the whole thing, but looking back on it I think I had pressed the 'perspective distortion' button which had caused it to lose the perfect symmetry. This is something I will have to remember for next time.