Well now, after Jamies far reaching explanations I see a chain with hammered tie straps where they ride on the bar, one side is badly mushroomed while the opposite side is in fairly good condition. This condition will cause a chain to ride in a sideways tipped over condition thus causing the chain to cut to one side. Discuss.
In my photos? The mushroomed up chain on the black bar is a little 16inch hardnose used for cutting dirty blue gum stumps and roots in clay and dirty firewood logs as a sacrificial offering to the keeping warm gods. It dam well should be looking as feral as it does.