I'm not sure, but I've talked to many primal users who have stated it was, or that it could have to do with their partner strike.

I would be interested to know, if anyone from the primal team can inform me why this happens.

I like yo spam zap people sometimes for fun, everyone else it works using my Rizful, but primal I can only zap them once then need to wait a minute or so to zap them again.