I think this means that you have to post at least 5 times each day to not decrease. If you post more, it'll be increased. Maybe it has something to do wit your average posts (you can check them in your profile). I'm not that sure, but that's what I got from the explanations and it seems a kinda reliable possibility to me.
BTW, it seems kinda clear that if your level increases, also the other stats will somehow increase.
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