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: 33a14388249d58ce3f1ea801c5ca6c9d4f2c529ba03a4c58de24dd5703bad187 and precert: true
parsed.tbs_noct_fingerprint: 33a14388249d58ce3f1ea801c5ca6c9d4f2c529ba03a4c58de24dd5703bad187 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.