My error and apologies. I was reading a different user's debug log (had two open in my browser).
Your active IP is: eth0 (192.168.1.30)
Your debug log does not show lighttpd running on any port.
*** [ DIAGNOSING ]: Ports in use
udp:0.0.0.0:5353 is in use by avahi-daemon
udp:0.0.0.0:55755 is in use by avahi-daemon
[✓] udp:0.0.0.0:53 is in use by pihole-FTL
udp:0.0.0.0:68 is in use by dhcpcd
udp:*:5353 is in use by avahi-daemon
[✓] udp:*:53 is in use by pihole-FTL
udp:*:36428 is in use by avahi-daemon
tcp:0.0.0.0:8080 is in use by lighttpd
[✓] tcp:0.0.0.0:53 is in use by pihole-FTL
tcp:0.0.0.0:22 is in use by sshd
[✓] tcp:127.0.0.1:4711 is in use by pihole-FTL
tcp:[::]:8080 is in use by lighttpd
[✗] tcp:*:80 is in use by apache2 (https://docs.pi-hole.net/main/prerequisites/#ports)
[✓] tcp:[::]:53 is in use by pihole-FTL
tcp:[::]:22 is in use by sshd
[✓] tcp:[::1]:4711 is in use by pihole-FTL
Something is cycling lighttpd:
-rw-r--r-- 1 www-data www-data 208 15 août 18:38 /var/log/lighttpd/error-pihole.log
-----head of error-pihole.log------
2022-08-15 18:20:23: server.c.1513) server started (lighttpd/1.4.59)
2022-08-15 18:38:13: server.c.1976) server stopped by UID = 0 PID = 1
2022-08-15 18:38:14: server.c.1513) server started (lighttpd/1.4.59)
-----tail of error-pihole.log------
2022-08-15 18:20:23: server.c.1513) server started (lighttpd/1.4.59)
2022-08-15 18:38:13: server.c.1976) server stopped by UID = 0 PID = 1
2022-08-15 18:38:14: server.c.1513) server started (lighttpd/1.4.59)