Data brokers and people search sites obtain your personal information multiple ways, such as purchasing it from other data brokers, scraping other websites, etc. They then attempt to combine records for the same person into a single record on their site. Sometimes they combine records that are actually different people by mistake and create inaccuracies in their own data. Some of that is exposed before the paywall, some is sold after the paywall.
The records we return are the records the site is actively promoting when someone searches for you. We will cast a wider net to ensure we are catching all records the site may have about you.