When you see someone else's score go up, it may take longer for you to see your own score rise. Many theories exist about how the Snapchat Score updates, but almost everyone agrees it can take up to a week for the new score to appear. This doesn't seem likely (it usually updates much quicker than that), but if you are helping someone increase their score, the score may be delayed. The score may not have updated after a week because the activities that the user is participating in on the app (such as private messages) are not included in the scoring system.