This is a one-time occurrence that happens because Riffle is calculating the priority of the ITBs it found in your inbox during your account creation. If you refresh your project inbox, you'll see your new scores!
💡 Tip: If the project in question had limited information within the ITB email, itself, when you refresh the page, you may see a missing score. This is due to a few reasons; check out What does an empty "priority" mean?