Questions about ratings on codechef!

D’Code (Rated for Division 2) : I solved two problems and get ranked 165.
After Contest ends, i comeback profile but Rating Graphs constant !
I’m newbie and I do not know about this please explain to me!

Ratings take time to update. Usually 6-12 hours. But in this case, since another rated contest is going on (Nov Long Challenge) the ratings will be updated after it finishes. Your new ratings should be visible when you wake up on 12th November. Congratulations on your rank!