Actually the score decreases and increases and decreases and increases.
I don't know whether it has anything to do with the following rule from FAQ
:All scores are automatically added in your total score instantly when you solve the problem (unlike 3rd scores which may take 6 hours+ to update).
Anyway, I am uploading two screenshots (taken on 7th January) which show different commits in github. The second was taken few hours after the first had been taken.
And I have observed that it happens daily!!!
(my devskill username is mahrahat)