What you’re seeing is after the one-time use authorization code has already been used, as per the Authorization Code flow: Implement authorization by grant type | Okta Developer
Your app is successfully completing this authentication flow and now the ID/Access tokens can be used to receive information about the user (claims in the ID token) and access a secured resource server (authorized via an access token).
I recommend reading through the concept documentation we have about OpenID Connect and OAuth in case you’re new to it: OAuth 2.0 and OpenID Connect Overview | Okta Developer