why would other phones try connecting to secure wifi
Just to check.
I mean your answer is not wrong, what I'm getting at its why is your devices trying to connect when you can try to find networks, it just don't make sense. But have you tried finding your windows phone on your network?
That's a good point. Interestingly enough, I have never seen a Windows Phone do this. It's only ever been devices running an older version of Android.