Mysql multi-master active-active replication : replication doesn't happen for all slaves
Looking at you config, it seems you are missing log-slave-updates in your my.cnf files.

You will need to add this in to both masters my.cnf files and restart them.

This tells the slave database to take anything it receives from it's master, and copy from the relay log to the binary log so it can be replicated onwards.

e.g. 

Master 1 Updates a table. It gets written to the binary log on Master1 

This is replicated to Master 1's slaves (which are slave 1 and Master2)

In order for it to proceed to slave 2, master 2 has to be told to add it to it's binary log. This is what log-slave-updates does.