It sounds like there might be a discrepancy or a potential issue with the time zone settings on your devices.
Here are a few steps you can take to troubleshoot this issue:
- Go to your device's settings and verify the time zone settings. Ensure that the time zone for Rio Branco is set correctly to GMT - 5.
- Sometimes, software updates fix bugs related to time zone discrepancies. Make sure your iPhone and iPad are running the latest version of iOS.
- A simple restart can sometimes resolve minor glitches. Try restarting your iPhone and iPad to see if the correct time zone settings are reflected afterward.
- Remove and re-add the affected cities in the World Clock app. Sometimes, this action refreshes the time zone information and corrects any inaccuracies.
- The pic below is self-explanatory

- If the issue persists after trying the above steps, contacting Apple Support might provide more specific troubleshooting steps or identify if there's a known issue with the software that needs addressing through an update or patch.
Remember, time zone settings can also be affected by location services or network settings, so checking those configurations might also be helpful in resolving the issue.