When you play and save a golf round in the Hole19 App while Offline (not connected to the internet), that round will not sync automatically.
Head over to the 'Performance' section by choosing this option at the bottom bar of your Hole19 App. There you will find the list of all your saved rounds.
You can tell a round is not synced if it's greyed out and has a "refresh" icon.
To sync your round make sure you have a solid internet connection and it should automatically sync to your profile.