A mistake in calculations! ;)
If the calculations are done correctly then the sample correlation must lie within the closed interval [-1, 1].
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A serious error. The maximum magnitude for a correlation coefficient is 1.The Correlation coefficient is lies between -1 to 1 if it is 0 mean there is no correlation between them. Here they are given less than -1 value so it is not a value of correlation coefficient.
Why the value of correlation coefficient is always between -1 and 1?
The correlation coefficient is unaffected by change of origin or scale unless one of the sets of variables is multiplied by a negative term, in which case the correlation coefficient will become negative.
1.
No. The units of the two variables in a correlation will not change the value of the correlation coefficient.