Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:188.8.131.52.
Your query was changed from:
parsed.tbs_noct_fingerprint: 4a08539f6390430dfd4313832bfafadbf69ae26b1858644f5ff808477bcd90e2 and precert: true
parsed.tbs_noct_fingerprint: 4a08539f6390430dfd4313832bfafadbf69ae26b1858644f5ff808477bcd90e2 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.