Hello BHW, There is something that happened last day with my website's backlinks as I can see today in ahrefs.com tool please check below. There is one website where I posted link as comment. I only did one backlinks per domain. But As I can see in that tool there are 1000 backlinks from same domain on 25 April 2013 and nearly 700 backlinks from that same domain on 26 April still counting... Does this cause my current ranking? how to prevent this in future? Please help me here.