Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:126.96.36.199.
Your query was changed from:
parsed.names: (*.travel.rakuten.co.jp or dns_names)
parsed.names: (*.travel.rakuten.co.jp OR dns_names)
If this isn't what you intended, you can run your raw query without expansion.