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: 6cba7d211cb9707fd273dde37bb8a21f7ba2dc0410b8f006937cc4a625d7455a and precert: true
parsed.tbs_noct_fingerprint: 6cba7d211cb9707fd273dde37bb8a21f7ba2dc0410b8f006937cc4a625d7455a AND precert: true
If this isn't what you intended, you can run your raw query without expansion.