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BUG? docker swarm ports available on IPv6 only

i’ve set up a docker-swarm on some SLES 12 SP4 machines and it seems everything is working fine except exposing ports via IPv4. For example i have a testing-swarm of two machines and i set up one webserver-service (nginx) which should be exposed on port 80 with replicas=1.

Current situation:
The webserver can only be accessed via IPv4 on the node where the service is really running (checked via docker service ps.…) on, but via IPv6 the service is available on all machines.

Just to clarify: There is no firewall in between.

Any idea what to check, what to change, …? I’m a bit lost on this…