List with effect cue does not get stomped propperly, when overridden

I have a bunch of lists with just one cue in it each. All cues consist only of pan/tilt effect values (I quadruple checked it. Really! ;-) ). No static values. All lists are on persist on override. So when I first trigger these lists one after each other, the previous lists get stomped and are marked grey as they should. If I re-trigger those stomped lists and than override them with another, these lists go to blue instead of grey. I figured out that, as soon as I add a static value to the lists, they always go to grey as I expect them to do and not only the first time. Is this a bug or expected behavior and if yes, why?

Road Hog 4
Hog OS 3.12
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