I easily fixed it by adding the _scaleX and _scaleY variables to the prDraw9Patch method call within prGuiButtons Draw method:
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I also noticed that some other gui components (e.g. prGuiInputBox and prGuiSliderKnob) also do not have the _scaleX and _scaleY variables added to their prDraw9Patch call. I am not sure if all this was intended or not.