how that can be?
I would suggest that you continue to post, and learn about bitcoin; read the stickies and increase the quality of your posts. Then make at least one post after this Tuesday. If you do all of this then I am fairly certain that your activity will double (assuming that you make the post late enough in the day on Tuesday).
You only have to post once per two-week period for your time (# of 2-week periods) to increment; your activity would be based on your post count if that's all you do though