My apologies — it's a bug. The USD amount in referrals is overstated by 10x, so you have earned 0.00007032 BTC through referrals which equals $.60, not $6. It's on our schedule to fix that bug this week! And the Bitcoin you earn through referrals is put right into your normal Bitcoin balance, which therefore reflects survey and referral earnings. Your lifetime earnings as shown on the leaderboard page are only survey earnings and do not reflect referral earnings.