Let's calculate!
Based on your current activity:
All users start with 20 points: 20
56 questions with a best answer chosen: 56 * 2 = 112
16 answers chosen as best answer: 16 * 20 = 320
52 upvotes: 52 * 10 = 520
6 downvotes received: 6 * -10 = -60
1 downvote given: 1 * -2 = -2
20 + 112 + 320 + 520 - 60 - 2 = 910
Which is the current number of points you have. Looks good!
You might have just received a downvote on another post.