The map usually turns blue due to the following reasons:
1. Insufficient storage space on your device. Please check the storage space of your device and clean up junk files.
2. Your device is low on storage space. You may have this issue when you are using an old device or have low storage space. You can try logging in on a different device with more storage space or cleaning up more junk files.
3. Data download error. This issue may occur if you are in the process of updating resources when the network is unstable. Please free up some space on your device and reload the data.
If none of the above solutions work, please contact a customer service agent.