Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:188.8.131.52.
Your query was changed from:
parsed.tbs_noct_fingerprint: 89a5ee5a790c8cf898cc02ee3d2c940fc67f96002aaa8cda31cc08507cebc363 and precert: true
parsed.tbs_noct_fingerprint: 89a5ee5a790c8cf898cc02ee3d2c940fc67f96002aaa8cda31cc08507cebc363 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.