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Ipsec between two sophos xg firewall - ipnat 169.254.234.5

Hello, I am using various XG Firewall (in a lab environment) with ipsec tunnel in full meshed and all are work up and running (active and connection ok). The dummy name are:  FW1, FW2, FW3

however some tunnel work correctly and some doesnt permit the vpn traffic to pass correctly


The situation is:

FW1--> FW2, FW3 --> OK

FW2--> FW1,FW2--> KO

FW3-->FW1,FW2--> KO

Sniffing the ipsec0 logical interface I notice:

SF01V_SO01_SFOS 15.01.0 MR-1.1# tcpdump -nni ipsec0 host 169.254.234.5
tcpdump: Starting Packet Dump
23:11:14.054519 ipsec0, OUT: IP 169.254.234.5 > 192.168.10.100: ICMP echo request, id 4, seq 48107, length 40


The source IP must be the private IP of the PC...


Why I see the snated with IP related to the ipsec0?

2: ipsec0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 16260 qdisc noqueue group 0x05 nfmark 0x200 nfmark6 0x200 nettype 0 gwoffset 0 gwoffset6 0 np 0 np6 0 state UNKNOWN group default
    link/ether 8e:9c:d0:fc:d1:c2 brd ff:ff:ff:ff:ff:ff
    inet 169.254.234.5/32 scope global ipsec0
       valid_lft forever preferred_lft forever

Thank you



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