I might be wrong, but please check any article page in Helius and all other themes that have the same files in their main directory (e.g., HeliusGrey, fisubSilver, etc.), and look at the distance between the central table and the sideblocks. It seems to me different on all sites I have visited, using the above-mentioned themes.
I've just installed the great Helius theme (thank you, mikem!) and found the same difference. See
http://www.orientalgate.org/article365.html
Any hints how to make the spaces equal?
Thank you!