Completed Task now shows not completed

I would like to know what happened to my account, why are my points being deducted?
I completed the task “Setup SSL for NGINX” which was on Jun 5 and I was awarded 300 + 150 points which raised my score to 20,030. Now Today I open my account to find out the same task has been assigned to me and my score is at 19,700? Please look into this issue as I dont know why is this happening? and this has happend 2-3 times. I have attached screenshots.