Servers in Server list dissapeared

Today I decide to log onto MC. Pure, vanilla MC, not going through any special launchers or mods.

I click on my server list, and find that the top server will load and is still there, but all the other server listings are not connecting. Pretty strange. I click on 'Edit Server' on one of these slots, and find all the server information is not there. "Poof!" it's gone. I tried restarting, but nothing happened, what I did note is I couldn't find a server listing file in the .minecraft area.

But I still find it strange one server, which is at the top of the list, remains while all the others are gone.