On delete cascade by default set to on delete restrict in mysql

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MySQL

I have two tables music and music_details with foregn key relationship. When i delete records from parent table automatically delete the records from child table. So I applied on delete cascade on update cascade for child table. it works perfectly for 1st time.but when i open the database next day its set to on delete restrict. whats is the problem in my tables.

follwing are my tables..

Music:
---------
music | CREATE TABLE `music` (
  `music_id` int(11) NOT NULL AUTO_INCREMENT,
  `movie_name` varchar(100) DEFAULT NULL,
  `movie_image` varchar(100) DEFAULT NULL,
  `music_director` varchar(150) DEFAULT NULL,
  `cast` varchar(150) DEFAULT NULL,
  PRIMARY KEY (`music_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

Music_details
-------------
 music_details | CREATE TABLE `music_details` (
  `music_id` int(11) DEFAULT NULL,
  `songtitle` varchar(150) DEFAULT NULL,
  `duration` time DEFAULT NULL,
  `artist` varchar(100) DEFAULT NULL,<pre lang="SQL">

`lyricist` varchar(100) DEFAULT NULL,
`status` varchar(50) DEFAULT NULL,
KEY `music_id` (`music_id`),
CONSTRAINT `music_details_ibfk_1` FOREIGN KEY (`music_id`) REFERENCES `music`
(`music_id`) on delete cascade on update cascade
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

But when i open the database in next day the tables structure changed as

music_details | CREATE TABLE `music_details` (
  `music_id` int(11) DEFAULT NULL,
  `songtitle` varchar(150) DEFAULT NULL,
  `duration` time DEFAULT NULL,
  `artist` varchar(100) DEFAULT NULL,<pre lang="SQL">

`lyricist` varchar(100) DEFAULT NULL,
`status` varchar(50) DEFAULT NULL,
KEY `music_id` (`music_id`),
CONSTRAINT `music_details_ibfk_1` FOREIGN KEY (`music_id`) REFERENCES `music`
(`music_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |



Whats problem in my table structure.