Why the number of points is decreasing?

I have been learning in Lingq since March. I have noticed strange thing that when I don’t open Lingq for one day or more the number of points I have collected is decreasing. Two days ago I had 433 , today it is 411 ? Why is it happening ? I know I am getting points for being active, but why my points are taken away ?

Here we go again…

The points you see are from the last 30 days, so if you saved 1000 LingQs 31 days ago (and thus had a high activity score up till yesterday), those won’t be counted today. Therefore, the score will go up and down, unless you’re saving (and learning) exactly the same number of LingQs each day.