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:
38d2cde450d358060fc99e82865fc4520160b8c7e39110bcbbdb1cf259897d2d
to
38d2cde450d358060fc99e82865fc4520160b8c7e39110bcbbdb1cf259897d2d
If this isn't what you intended, you can run your raw query without expansion.