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: 0a6dfd2fb6b098f9fd822664a9d6200e6f18246a3135ecd26942d329823fdd39 and precert: true
parsed.tbs_noct_fingerprint: 0a6dfd2fb6b098f9fd822664a9d6200e6f18246a3135ecd26942d329823fdd39 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.