Java duplicate in lsof output

$ lsof -P -iUDP
COMMAND    PID            USER  TYPE  SIZE/OFF NODE NAME
java      1253             jvb  IPv6       0t0  UDP HOSTNAME:10000
java      1253             jvb  IPv6       0t0  UDP [DOMAIN.COM]:10000
java      1290          jicofo  IPv6       0t0  UDP *:22781

I was wondering whether duplicate entries of PID 1253 could cause an issue with Jitsi.

Here’s my hosts file:

$ bat -p /etc/hosts
127.0.0.1   localhost   jitsi.[DOMAIN.COM]   HOSTNAME
[IP ADDRESS]    DOMAIN.COM

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

0.0.0.0 pastebin.com

$ hostname
HOSTNAME

$ hostnamectl
   Static hostname: HOSTNAME
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 
           Boot ID: 
    Virtualization: kvm
  Operating System: Ubuntu 18.04.4 LTS
            Kernel: Linux 5.3.0-61-generic
      Architecture: x86-64

Also, I allowed inbound IPv4 connexions only:

$ ufw status
80/tcp                     ALLOW       Anywhere
443/tcp                    ALLOW       Anywhere
4443/tcp                   ALLOW       Anywhere
10000/udp                  ALLOW       Anywhere

So, is it a problem if I still see IPv6 in the output of lsof command even though I only allowed inbound IPv4 connexions?