why is it a shame seems perfectly sensible to me
I thank Stalin may have lied when he did the test, there's no way he was that economically liberal, I mean his population didn't exactly share the wealth did they? He mostly kept it for him and his mates.
I think you're somewhat confused about the positions within the text.
Left wing - right wing refer to economics, going from total state control of the economy on the left at -10 to total economic freedom on the right at +10.
The social aspect goes from -10 to +10 depending on how much you believe the state should control the social aspects of society.
Stalin is well into minus figures on the scale because his state controlled the economy, in other words the government controlled the money, which fits in exactly with what you have said, and what you have posted in support of.
In a free economy, individuals are free to make money and the economy is managed by individuals, not by the state.