Default Alarm did not ring at the morning (KulayOS ROM 2.0)

Since I am new to XDA so I can not reply on the development forum, please someone help me passing my question to tantrums. Thanks.

My Find 7a is running KulayOS ROM 2.0 and I love it. But I got a serious problem on this ROM. My alarm never rings at the morning. I have tried different alarm apps such as the stock alarm, Alarm clock extreme free, Alarmy etc. All failed. If I test the alarm like set it to ring after 5 minutes from now, it works perfectly. But it never rings after an overnight deep sleep. I did not encounter this issue on stock OPPO ROM or CM. But I cannot live without the stock Waves effect .

Does anyone got the same problem? Any solution? Please help.