Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:126.96.36.199.
Your query was changed from:
parsed.tbs_noct_fingerprint: 08455ac172fbc9c86f3e42ee2a04c6770ca7b6973a0ab8866eb8f727a8554144 and precert: true
parsed.tbs_noct_fingerprint: 08455ac172fbc9c86f3e42ee2a04c6770ca7b6973a0ab8866eb8f727a8554144 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.