Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:141.212.120.90.
Your query was changed from:
parsed.spki_subject_fingerprint: 2c1fb55882eb4d8c782a3fd3eb37e60c0518b5eedd91149a5b3e5a5a234a1c5f
to
parsed.spki_subject_fingerprint: 2c1fb55882eb4d8c782a3fd3eb37e60c0518b5eedd91149a5b3e5a5a234a1c5f
If this isn't what you intended, you can run your raw query without expansion.