Mysql checksum for master-slave replication returning different values, despite being identical
There is better way to check whether the master and it's slaves are in sync.  

Run pt-table-checksum on the master. 

Then if it shows some tables are different use this script to see where exactly the difference is. http://bazaar.launchpad.net/~akuzminsky/+junk/stats-scripts/view/head:/compare_tables.sh

./compare_tables.sh master_ip slave_ip database table