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replication issue for 4 servers

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I have 4 mariadb servers. - data update on server_id=1, data will replicate to all 3 servers (2,3,4) - data update on server_id=2, data will replicate to server-1. but after the server-1 got the changes, the server (3,4) will not get updated.

Please help.

server 1 (MASTER/SLAVE):
[mariadb]
log-bin
server_id=1
log-basename=master1
binlog-format=mixed
auto-increment-increment=2
auto-increment-offset=1

server 2 (MASTER/SLAVE):
[mariadb]
server-id=2
log-bin
log-basename=master2
binlog-format=mixed
auto-increment-increment=2
auto-increment-offset=2

server 3 (SLAVE):
[mariadb]
server_id=3

server 4 (SLAVE):
[mariadb]
server_id=4

Answer Answered by Daniel Black in this comment.

log_slave_updates is needed on replication slaves that replicate to other servers. So I assume in your case server_id=1,2

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