Its all about common sense to know that a potential account with 480+ potential activity can't have 240 activity with 300 posts
His posts will always equals to his activity until all potentials are eaten up 
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I believe the activity rules had changed these days,requiring to get full acticivity 14 posts at the period of the 14 days,before as i record you only need one single post to get the full activity,soo this is possible ,im not sure if the current activity changed but before any of you bid here be sure that this staked message isnt recent,always ask for the older adress ,otherwise you may find problems has already happened here.