Easing curve presets are incorrect

Many provided easing curves that come with the easing curve editor have standard names which are not only common throughout animation tools but the names also define the underlying formulas.

For example, the formula for easeInQuad is x*x, which describes a purely progressive function. All easeIn[Sine/Quad/Cubic/etc.] should be progressive. In terms of beziers, that means that the handles should always be below the curve.
However, easeInQuad has the following non-progressive shape:

The EaseInOut* curves should be point reflective tr("punktsymmetrisch") around the functions' saddle point in the center.
Here is how QDS's easeInOutCubic looks like: