See the attached picture for my proxies. geode.kvedulv.de is only in the location "Home", but still is showing up in the search results via API:

mmoll@sledge:/tmp$ http --verify=no --auth mmoll:xxx 'https://sledge.kvedulv.de/api/smart_proxies?search=location=GCSC2'
[...]
{
    "page": 1, 
    "per_page": 20, 
    "results": [
        {
            "created_at": "2017-02-25 21:35:42 UTC", 
            "features": [
                {
                    "id": 4, 
                    "name": "DHCP" 
                }, 
                {
                    "id": 16, 
                    "name": "Logs" 
                }
            ], 
            "id": 3, 
            "name": "geode.kvedulv.de", 
            "updated_at": "2017-02-25 21:35:42 UTC", 
            "url": "https://geode.kvedulv.de:8443" 
        }, 
        {
            "created_at": "2015-04-10 11:19:19 UTC", 
            "features": [
                {
                    "id": 6, 
                    "name": "Puppet CA" 
                }, 
                {
                    "id": 5, 
                    "name": "Puppet" 
                }, 
                {
                    "id": 14, 
                    "name": "Dynflow" 
                }, 
                {
                    "id": 15, 
                    "name": "SSH" 
                }, 
                {
                    "id": 16, 
                    "name": "Logs" 
                }, 
                {
                    "id": 2, 
                    "name": "TFTP" 
                }
            ], 
            "id": 1, 
            "name": "sledge.kvedulv.de", 
            "updated_at": "2016-09-14 18:25:54 UTC", 
            "url": "https://sledge.kvedulv.de:8443" 
        }
    ], 
    "search": "location=GCSC2", 
    "sort": {
        "by": null, 
        "order": null
    }, 
    "subtotal": 2, 
    "total": 2
}

This has been addressed by #20872