Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:220.127.116.11.
Your query was changed from:
parsed.tbs_noct_fingerprint: d6f834699a22fd97c0ade25912685e8d06d927a1cee7dbd299319b2546e42567 and precert: true
parsed.tbs_noct_fingerprint: d6f834699a22fd97c0ade25912685e8d06d927a1cee7dbd299319b2546e42567 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.