Cluster not syncing from a standalone Mysql Server

I had setup a 3 node cluster in production network. And I am replicating the data from a Standalone MySQL Server to one of the node(node1) through master slave replication.

I can replicate data within the cluster. But the problem is the data replicated from the Standalone server to the node1 is not replicating across the node2 and node3. I can see the exact async replica of MySQL standalone server in node1.

Thanks in advance.