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.extensions.authority_key_id: f7c4673e0561111e0392c59aa8a068d863475da5
to
parsed.extensions.authority_key_id: f7c4673e0561111e0392c59aa8a068d863475da5
If this isn't what you intended, you can run your raw query without expansion.