The out-of-sync problem between Youdao Translator and NetEase Cloud Music may be caused by a variety of factors. Here are some possible causes and solutions:

1. Network connection issues: Please make sure your device is properly connected to the Internet to ensure that data can be transferred and synchronized correctly.

2. Software update issues: Check whether your Youdao Translator Pen and NetEase Cloud Music application are the latest versions. Occasionally, updates may contain fixes to fix sync issues.

3. Login issues: Make sure you use the same account to log in to Youdao Translator Pen and NetEase Cloud Music application to ensure that the data can be synchronized correctly.

4. Cache problem: Try clearing the cache of Youdao Translator Pen and NetEase Cloud Music application. This will remove temporary files and data that may cause sync issues.

5. Device setting issues: Please check the settings of Youdao Translator Pen and NetEase Cloud Music application to ensure that the synchronization option is enabled and you have selected the correct synchronization range.

If you have tried the above methods but the problem still exists, you can contact the customer support team of Youdao Translator or NetEase Cloud Music for more detailed help and guidance.