clan point rank system

Hi there, I'm try to find somewhere the clan point system or how the clan point it works.
I read somewhere about clan war. If the clan win the clan match all members will earn 5 cp per player. Is this true? anyway i know for 500exp=1cp and max per 24h 10cp=5000exp bla bla bla.
And i know about leaving the game when earned 400 exp and rejoin the exp will lost and start from begin. But i don't get it. My clan is so active 20 person per day at last earning 200 cp at last every day but still not get rank down.
Can you help me to learn better the clan point system or At last what im doing wrong?
Best regards

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