It is possible that the issue is due to a sync problem between your device and Viber's servers. You can try the following steps to resolve the issue:
1. Check your internet connection: Make sure you have a stable internet connection.
2. Clear cache and data: Go to your device's settings, find Viber in the application manager, and clear its cache and data. This may help refresh the profile photo.
3. Reinstall Viber: If clearing cache and data does not work, you can try reinstalling the Viber app. Make sure to backup your chats before doing so.
4. Contact Viber support: If the issue persists, you can reach out to Viber's customer support for further assistance. They may be able to provide specific troubleshooting steps for your device.
Note: These suggestions are general troubleshooting steps and may vary based on your device and Viber version.