The following are potential reasons for why your registration is not showing under "My Registered Races":
1) Your registration is associated with a sub-account of another user.
Someone registered you for a race using their account, so you were created as a sub-account. Please email firstname.lastname@example.org for assistance.
2) Your registration was imported.
Many Races will process entries manually. You just need to claim your uploaded account as described here.
3) You used a different email address to register.
You can merge accounts with different email addresses by following the guide here
4) You did not complete your registration.
First look to see if you are registered on this race's "Find a Participant" page. If you still do not see yourself and have a charge on your credit card that has posted, please contact email@example.com. If you do not see yourself here, and you also have no charge on your account, then you are not yet registered.
5) You registered under a typo email address.
If you find your registration on the race's "Find a Participant" page, but you don't see it under your account (and you have claimed ALL possible accounts as explained above), then you may have registered under a typo. Please contact firstname.lastname@example.org.
6) You registered under a duplicate sub-account
You may have accidentally registered using a duplicate sub-account that is in your name. Click the blue account buttons on your Profile to see if there is one that has this Race under it's Upcoming Events section. You can use the Consolidate Accounts function to combine duplicate accounts.