Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:18.104.22.168.
Your query was changed from:
parsed.tbs_noct_fingerprint: f0fc2bb6d5ca5cb291bfb660babfeb950414902715f2fb81772539d0e3038918 and precert: true
parsed.tbs_noct_fingerprint: f0fc2bb6d5ca5cb291bfb660babfeb950414902715f2fb81772539d0e3038918 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.