Change the volume name.

templates/portainer-agent-stack.yml.j2

@@ -1,7 +1,7 @@
 version: '3.2'
 
 volumes:
-  portainer_data:
+  portainer_server_data:
   {% if docker_swarm_portainer_nfs_volume %}
     driver: local
     driver_opts:
@@ -10,7 +10,7 @@ volumes:
       o: "{{ docker_swarm_portainer_nfs_o }}"
       device: "{{ docker_swarm_portainer_nfs_device }}"  
   {% endif %}
-  
+
 networks:
   {{ haproxy_docker_overlay_network }}:
     external: true
@@ -37,7 +37,7 @@ services:
     image: portainer/portainer-ce
     command: -H tcp://tasks.agent:9001 --tlsskipverify
     volumes:
-      - portainer_data:/data
+      - portainer_server_data:/data
     networks:
       - {{ docker_swarm_portainer_network }}
       - {{ haproxy_docker_overlay_network }}