I have a membership database and a View of Local Leaders info, but it is showing each person twice in the View's list. I have tried to delete the contacts and input them back in they still show up double.
If I had to guess, I'd say your "Look up Leaders" functionality is built with Views in Drupal or Backdrop, and it shows up double because there are two different "Other" phone numbers for these contacts. It's treating them as two different entries.
If that is the case and if it's possible to remove or relabel the second phone number location type in the contact records (ie. not have two "Other" phone numbers -- although you could have multiple phone numbers if they have different location types) I think it would solve the issue.
EDIT Upon closer inspection, the second "Other" number appears to duplicate the "Mobile" number. In the contact record, try deleting the duplicate number with the "Other" location type.
If I had to guess - you have duplicate contacts.
I would check out the user guide - https://docs.civicrm.org/user/en/latest/events/online-event-registration/#contact-matching-and-duplicate-management
Go through your contacts and merge duplicates. (Contacts>>>Find and Merge duplicate contacts) Maybe start with a couple to see if that is the source of your issue. This could have happened due to many factors - but most likely because you have a form or created an import and did not select any duplicate matching rules.