Black-box Penetration Test 2 - Host Identification

Hi guys,

In the Black-box Penetration Test 2, the second machine is found by viewing the network interface list (ifconfig). We see the host IP address ends with 2. (Host 2?)

Later, when proxychains is used to perform an nmap scan of the second machine, the host passed to the nmap command ends with 3 (Host 3?) (see below image). Why is that? Sorry if this is a silly question.