Points change all the time as people get questions and answers voted up and down. If someone else got more points than you they probably just answered more questions.
I'm also playing with the points system now and again (how many points you get for each thing) so you may see fluctuations there. The idea is to give people more points for doing things better, like better answers or better questions.
NOTE: please don't vote down questions/answers for the hell of it. You should only downvote answers if they are incorrect, or questions if they are really badly worded or unclear or spammy.
Hope that clears some things up!