Why does Zabbix detect even non-existent hosts all in a row from 1 to 254?

Question

FreeBSD

I put zabbix5 on
- virtual machine freebsd12 and
- iron server freebsd11.4
and here and there I encounter a situation where detection does not work correctly -
it stupidly records / detects all network nodes with 1, 2, 3,4 .... 254 of
them even physically does not exist, but he adds them, he
wrote both ping and fping in the Zabbix ICMP script - does it help
what could be the problem of such strange behavior?

and arp -a prints these non-existent nodes in an incomplete state

? (172.17.20.116) at 84:c9:b2:ab:bf:a0 on vlan200 expires in 428 seconds [vlan]
? (172.17.20.52) at bc:f6:85:bd:13:d0 on vlan200 expires in 374 seconds [vlan]
? (172.17.20.215) at (incomplete) on vlan200 expired [vlan]
? (172.17.20.151) at (incomplete) on vlan200 expired [vlan]
? (172.17.20.87) at (incomplete) on vlan200 expired [vlan]
? (172.17.20.119) at 70:62:b8:5f:eb:98 on vlan200 expires in 671 seconds [vlan]
? (172.17.20.55) at 5c:d9:98:40:76:4a on vlan200 expires in 435 seconds [vlan]
? (172.17.20.214) at (incomplete) on vlan200 expired [vlan]
? (172.17.20.150) at (incomplete) on vlan200 expired [vlan]
? (172.17.20.54) at 6c:19:8f:a0:33:b7 on vlan200 expires in 66 seconds [vlan]
? (172.17.20.118) at 5c:d9:98:af:1c:0e on vlan200 expires in 611 seconds [vlan]

Answer 1

in general, the point is in the version of fping , the
current version of fping 5.0_1 does not work correctly,
you need to roll back to 4.4