Think of the Preset page as a base layer that must always be there to support the rest. This picture attached is how the WMX1 basically operates its DMX engine, there's certain stuff that is in the base level. for example if you de-select all of the colors for a group in the Static Color part, that groups intensity will be at 0.
But if you want to use a preset that has say a PT effect and color effect, but you want to turn off the color effect, you do so by going to the home page and pressing the button for the color effect for that group, and while that preset is playing, it wont play that effect, but it will play everything else.
My advice is, play around with it after programing more looks into presets and learn how it all responds and flows before thinking something isn't right, because your not sure how it worked just yet.