It came to my attention recently that one of my sites no longer has backlinks showing up in GWT. Its been almost a month now since my backlinks disappeared, but I'm at at loss as to why. The site is over a year old, and before a month ago it had around 5 backlinks from other sites in my network. All of the sites are "clean" with a spam score less than 2. I have other sites that are also linked similarly, with their links showing up. Has this happened to anyone else before? Can I expect them to show up again?