Google Webmaster: Drop Down in Links Count
From last 2 Days, there is a huge confusion out there regarding Google site links count in WMT.
It is reported by Google’s John Mueller
This looks like a bug or a temporary fluctuation with how the data is shown in Webmaster Tools. Your links are still around and being counted normally within our algorithms (at least the sample I double-checked) — this wouldn’t negatively affect your site’s crawling, indexing, or ranking in our search results. I don’t have a confirmation from the team yet, but we’ll update here as we know more. Thanks for your patience & sorry for the confusion!
So there is no need to worry about backlinks drop down in webmaster tools. Keep doing good work Google webmaster tool will soon back on normal for more info also check these links: