How to Remedy Inconsistent MySQL Replication SYSDATE Value
Virtually everything that is replicated is frozen before replication.  For example, RAND, NOW, UNIX_TIMESTAMP are all passed through the replication stream so that the Slave will have exactly what the Master has.

But... SYSDATE is an exception.  You should not use it if you want identical data.

Or...  "sysdate-is-now" is an option (either on the server commandline or via some setting).  This makes SYSDATE act like NOW.

What version are you running?  See http://bugs.mysql.com/bug.php?id=15101