Cancelled orders not put back onto stock quantity

Just noticed after a test that I had only 1 item left of a product. When I ordered it correctly set the quantity to zero and showed this on the front-end saying Out of Stock. But when I went in the backend and cancelled the order, the quantity is still showing as zero for that product when it should now be set to one.

That should be fixed with Hikashop 2.0. Could you try with the beta:
www.hikashop.com/en/forum/2-general-talk...ikashop-20-beta.html