It's because the rate plan has not been updated to balance information. Do following to update the balance information:
- Start LCMinutes to change your free minutes for evening (or for weekend, long distance), and save the rate plan setting;
- Back to main window of LCMinutes, choose NO when prompted to question that whether you want to apply this changed rate plan to past calls and SMS;
- Quit LCMinutes and check the today display.