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: dde9e4b87ecea11e47159157422df2b9f3047bd1f69bede8fbf14fc4c31664cd and precert: true
parsed.tbs_noct_fingerprint: dde9e4b87ecea11e47159157422df2b9f3047bd1f69bede8fbf14fc4c31664cd AND precert: true
If this isn't what you intended, you can run your raw query without expansion.