I imagine a CCJ was set aside pending the outcome of the IVA and, as the IVA was successful the CCJ will be set aside on the date mentioned as the debt has been settled otherwise.
The CCJ will probably still be showing on your credit file and will remain visible, even after the set aside date for 6 years from the date the CCJ was issued, which should have been before the IVA, so, should be disappearing soon. I would enquire of the CRA (as well as checking the others).
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014 http://foggy.blogs.iva.co.uk