Out of 400+ referrals, only 9 are active ones. The rest of those persons are not using the freebitco site. That's strange because if they naturally joined with your referral links they should remain active.
How did you promote your referral link to get that many inactive referrals ? Did you offer them any incentive for joining with your link ?
It's a strange occurrence but most of us tend to face this after heavily advertising. They somewhat "died" after joining; no clicks whatsoever.
Incentives don't always work if they only want quick and easy profit.