We experienced some issues with our referral program between the 23rd to the 24th of June. The issue has since been fixed, and you should have no problems receiving your referrals. Unfortunately, you may be missing a few referrals for that period of time.
To recover any missing referrals, ask the users that you referred to send an e-mail to our support team which explains that they were referred by you. Make sure to remind them to include either your username or e-mail as well.
Sorry for the inconvenience, but we've made sure that this issue won't occur in the future.