I don't know if this has been reported before (couldn't find anything) but I think 2048 is not sending a score? I play it for fun, but since there's the button, I sometimes tried to send the score and I had the impression that I never got any sP? This issue occurs when using both safari and firefox.
It's one of the few games that doesn't actually give out any sP. The send score button is only for triggering the achievement once you get a high enough score to get it.
Otherwise it's just meant to be played for fun. c: