In mathematics and geometry, you get used to the convention that the Coordinate origin is at the bottom left. Rising y-values therefore lead upwards. In most common programs, however, it is the case that the Origin is at the top left so that increasing y-values point downwards. Unfortunately, this corresponds to a reflection on the x-axis, or a straight line parallel to it.
And orientation suffers as a result: what moves clockwise in one model is exactly the opposite in the other. The elliptical arcs of Svg are particularly affected by this.