Yes, it is possible that in there are many duplicate profiles of you. Some might have been entered by the organiser and some by you. All these profiles can be merged by contacting the User Support.

When asking for a profile merge, be explicit 

In the case of non-matching data, do note that FIBA user support may ask you to provide supporting evidence that the profiles to be merged are indeed of the same person and belong to you. Be aware that all merge requests are tracked and can be rolled back. Claiming somebody else's profiles is a sanctionable violation of the Terms & Conditions.

Rankings are calculated every day at @1200 UTC, after which only the correct, combined ranking points will be visible in your profile. We recommend self-registering to all the future events with this merged profile in order to prevent further duplicates.