Participation in the Community support forum is a 1 for 1 point ratio meaning for every answer, question or up vote you add points. For instance, when you answer a question you add 50 points. Up-votes give you 20 points and down-votes subtract 10 points. Next to your screen name you see the total points you have gained this year. The link you provided brings you to a page that outlines your total activity and that total you see is the raw points you have accumulated starting at the beginning of the year.
By clicking on the Rewards badge from your profile stats you will see a Specification of your points table. Your current points = 2040. That total is divided by 100 and it should show up as 20.40. It takes 24 hours to update so if you have gained points today you won't see that change until tomorrow.
Hopefully, I didn't over explain it or cause further confusion because I know you have experience on this forum.