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:
1b03d34027346e55a01a122f384fec27c86570247b77bc2a8b7dc4a9e702106c
to
1b03d34027346e55a01a122f384fec27c86570247b77bc2a8b7dc4a9e702106c
If this isn't what you intended, you can run your raw query without expansion.