Reward points are the points you earn from your payments, and are used to redeem your rewards. These will go up as you earn, and down when you use them. Lifetime points are a running total of all your reward points, and are used for your levels. Lifetime points will not go down.
Example: In your Agora Advantage Club account, you have 1200 reward points and 1200 lifetime points. You then purchase a new model, and you want to claim your free pack 1. You use your 1200 reward points to claim this reward.
In your account, your points will now show 100 reward points (points earned for pack 1) and 1300 lifetime points (Your 1200 plus 100 points for your new purchase of pack 1).