Always look at the or word count . In fuzzing, the "anomaly" is the answer. If 99% of requests return 100 words, and 1 request returns 150 words (or 0 words), that is your target.
If you get a different response for admin.target.htb , add it to your /etc/hosts file and browse to it. This new vhost is often the actual target of the assessment. htb skills assessment - web fuzzing