To resolve the issue of the Sleeper app not updating scores on the matchup screen, follow these steps:

1. Restart the App: Close the Sleeper app completely and reopen it. This simple step can help refresh the connection and retrieve any updates.

2. Check for App Updates: Ensure that your Sleeper app is up to date. Go to your device's app store to check for any available updates. Sometimes, bugs are fixed in newer versions.

3. Clear Cache and Data: If you are using an Android device, you can clear the app cache and data:
- Go to your device's Settings.
- Select Apps or Application Manager.
- Find and select Sleeper.
- Choose Storage and then select Clear Cache. If issues persist, consider Clear Data, but remember that this may delete your logged-in status and app settings.

4. Check Internet Connection: Ensure your device has a stable internet connection. A weak connection can prevent the app from updating scores in real time.

5. Refresh the Matchup Screen: On the matchup screen, perform a pull-to-refresh action (if supported). This may help in manually refreshing the scores displayed.

6. Consult the Community: Visit forums such as Reddit for discussions surrounding your issue. Other users may be experiencing similar problems, and the community often generates effective solutions. For example, discussions have noted that scores may not update automatically, even with attempts to refresh - learn more - learn more.

7. Review Stat Correction Policies: Understand that statistical corrections may happen after games. This can impact live scoring. The Sleeper app runs stat corrections, which can affect scores displayed during and post-game - learn more.

8. Reach Out to Support: If issues continue, consider contacting Sleeper Support directly for specialized assistance. They may provide insights specific to your account or device - learn more.

If after trying all these steps the problem still persists, it may be due to a bug within the app that needs addressing by the development team. Keeping an eye on updates and community feedback is recommended.