using ffuf with ZAP for Vhost discovery

[someone here]

while i was using ffuf tool to brute force a virtual host discovery i used this command to proxy the requests through ZAP on port 8888 

ffuf.exe -H "Host: FUZZ.example.com" -u http://ip -w E:\vhost-wordlist.txt -X POST -x http://127.0.0.1:8888

so when i saw the requests in the zap history i expected that it will be like this 

POST http://ip/ HTTP/1.1
host: someword.example.com
User-Agent: Fuzz Faster U Fool v1.5.0-dev
Content-Length: 0

But i found it like that 
POST http:// someword.example.com  / HTTP/1.1
host:  someword.example.com
User-Agent: Fuzz Faster U Fool v1.5.0-dev
Content-Length: 0

did ZAP modify the URL from ip to the host header or it is the effect of the ffuf tool and how i could fix this 

Thanks in advance