Its a bit of a problem because it is showing 1px extra of the next node icon in the sprite and I don't really no what to do to fix it.
Update: I just found the reason for the above. Seems that happens if I zoom chrome browser to 110%. What is stranger now is that if I zoom beyond 110%, the size is back to 36px by 36px.
Could there be a css fix for this or should I just make my sprite have a free pixel on each side so that this can be avoided if someone is zooming?