Unskewed child not aligning

Question

Note: This question is about a problem with output, and not about creation of any shape.

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I recently created a shape :

Answer 1

By way of a revision of my initial answer which produced an output rather than an explanation, I would postulate^* that the effect is seen because you are surmising a negative skew can be used to offset a position on the positive skew curve, when in fact- at minus values you are operating on the negative skew curve.

This would first require that the measure of skew was singular and occurring on the same curve (see normal curve below), with positive and negative values allowing to shift along the curve.

However, the curve for negative and positive skews are inversly tailed.

Zero skew is the only value which operates the same on both. As such, if you have an element, apply a skew of 20 degrees to it, then apply a skew of minus 20 you will actually have a skew (positive or negative) of zero, so using a negative offset appears to work..

However, if you then apply additional negative skew, you will have a negatively skewed element, the curve for which is different and not equal to the inverse equivalent position on the positive skew curve.

20deg = Original element, 20deg on positive skew curve

20deg - 20deg = 0, same for positive and negative skew curve

-40deg = taking the elements current 20deg skew, minus 40 deg = 20deg on negative skew curve - NOT an equivalent 'opposite' point on the positive skew curve

When using psuedos, the skew works because you arent offsetting a positively skewed value by a newgatively skewed amount.

^* Im no mathematician, so afraid I can only claim this as conjecture