Depending on your Wi-Fi connection the badge may not appear or may appear delayed.
Usually, the badge (the number or N mark on the icon) will remain until you check the updated information. If they are not displayed correctly, please try the following steps.
1. Delete any unnecessary apps or data on your device.
2. Restart your device.
3. Update your LINE app from the URL below.
Let us know if we can make it better.