Why does the Standard Deviation change in this way?

Graph Four -Descriptive Stats - Height - Explore Case Processing Summary Cases Valid Missing Total N Percent N Percent N Percent Height 496 100.0% 0 0.0% 496 100.0% Descriptives Statistic Std. Error Height Mean 67.0550 18322 95% Confidence Interval for Lower Bound 66.6951 Mean Upper Bound 67.4150 5% Trimmed Mean 66.9104 Median 67.0000 Variance 16.651 Std. Deviation 4.08051 Minimum 58.00 Maximum 81.00 Range 23.00 Interquartile Range 6.00 Skewness .539 110 Kurtosis .164 219