Add new node in Swarm cluster (portainer)

I have a swarm cluster with 4 nodes. When I add a new managed node on the cluster, the new portainer/agent doesn’t start correctly.

The log shows that the new node is alone…

[INFO] [main] [message: Agent running on Docker platform],
[INFO] [main] [message: Agent running on a Swarm cluster node. Running in cluster mode],
[INFO] serf: EventMemberJoin: XXXXXXXXXX-00fd07c765d4 10.0.1.159,
[INFO] [http] [server_addr: 0.0.0.0] [server_port: 9001] [secured: true] [api_version: 2.0.0] [message: Starting Agent API server],

While others:

[INFO] [main] [message: Agent running on Docker platform],
[INFO] [main] [message: Agent running on a Swarm cluster node. Running in cluster mode],
[INFO] serf: EventMemberJoin: XXXXXXXXX-8327402f3546 10.0.1.148,
[INFO] serf: EventMemberJoin: XXXXXXXXX-0621987cbbb8 10.0.1.150,
[INFO] serf: EventMemberJoin: XXXXXXXXX-efe6b5c0fb91 10.0.1.89,
[INFO] serf: EventMemberJoin: XXXXXXXXX-8936e2f87e63 10.0.1.142,
[INFO] [http] [server_addr: 0.0.0.0] [server_port: 9001] [secured: true] [api_version: 2.0.0] [message: Starting Agent API server],

How can I fix this?