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: 13ad9f460b84716924a65e2410aa1656ef729617a722ef5aba7f4f65a2daa988 and precert: true
parsed.tbs_noct_fingerprint: 13ad9f460b84716924a65e2410aa1656ef729617a722ef5aba7f4f65a2daa988 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.