issue tracker queries do not work as expected

A basic query looking at open issues:
http://bitbucket.org/isaiah/kiwi-public/issues?status=open

Now add the filter that it also must be a bug:
http://bitbucket.org/isaiah/kiwi-public/issues?status=open&kind=bug

This lists many more issues instead of fewer as expected.

It seems to me that query parameters are ORing instead of ANDing.