Server binding to both main and another ip?

I know this is not the facepunch forum and I know I should post this there but they never reply to anything.

So when binding the server ip it seems to bind to both the main ip and the one I set for it. This seems to be causing issues where steam can't ping the server but you can still join via game console and then using the IP I set. This also makes it really buggy when trying to list on the server list. It shows and then it doesn't show. Then it shows again and then it doesn't. Using: http://api.steampowered.com/ISteamApps/GetServersAtAddress/v0001?addr=xxx.xxx.xxx.xx shows that it's binded on the main IP and the one I set for it but it also shows there's no servers runnin on the ip I set for it.