Worst results if try set type and gender

[Keberdle]

Hi,
if I ask API for this:
http://hi.ondraplsek.cz/?name=Zde%C5%88ka&type=firstname&gender=female

I get:
{"success":false,"count":0,"results":[],"declension":{"1":"Zde\u0148ka","2":"Zde\u0148ky","3":"Zde\u0148ce","4":"Zde\u0148ku","5":"Zde\u0148ko","6":"Zde\u0148ce","7":"Zde\u0148kou","8":"Zde\u0148ky","9":"Zden\u011bk","10":"Zde\u0148k\u00e1m","11":"Zde\u0148ky","12":"Zde\u0148ky","13":"Zde\u0148k\u00e1ch","14":"Zde\u0148kami"}}

But I do not use &type=firstname&gender=female
http://hi.ondraplsek.cz/?name=Zde%C5%88ka
I get:
{"success":true,"count":6,"results":[{"nominativ":"Zde\u0148ka","vocativ":"Zde\u0148ko","type":"name","gender":"female"},{"nominativ":"Zdenka","vocativ":"Zdenko","type":"name","gender":"female"},{"nominativ":"Zd\u011bnka","vocativ":"Zd\u011bnko","type":"name","gender":"female"},{"nominativ":"Z\u010fenka","vocativ":"Z\u010fenko","type":"name","gender":"female"},{"nominativ":"Zdenka","vocativ":"Zdenko","type":"surname","gender":"male"},{"nominativ":"Zde\u0148ka","vocativ":"Zde\u0148ko","type":"surname","gender":"male"}],"declension":{"1":"Zde\u0148ka","2":"Zde\u0148ky","3":"Zde\u0148ce","4":"Zde\u0148ku","5":"Zde\u0148ko","6":"Zde\u0148ce","7":"Zde\u0148kou","8":"Zde\u0148ky","9":"Zden\u011bk","10":"Zde\u0148k\u00e1m","11":"Zde\u0148ky","12":"Zde\u0148ky","13":"Zde\u0148k\u00e1ch","14":"Zde\u0148kami"}}