User blog:Mmpratt99 deviantart/Could Someone Please Tell Me Why My Old Talk Page Has Been Completely Erased?

I just get this "Duplicated/Superseded file"in my e-mail, but I don't know what that means exactly. Could someone please explain to me what that means and how could I get my old information back? This is important. I don't know if this is part of the new wiki changes or an act of vandalism.