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:
66fd615734e2b6a9160dc2c76da5f25d9a1adce51073bf9e38de73e2eaca0233
to
66fd615734e2b6a9160dc2c76da5f25d9a1adce51073bf9e38de73e2eaca0233
If this isn't what you intended, you can run your raw query without expansion.