Google admitted to a bug causing some webmasters to show a deflated number of links within the Google Webmaster Tools link report.
There were several threads at Google Webmaster Help dating back to August 5th with complaints. In a few, Susan Moskwa updated these webmasters that there was a limited bug effecting some webmasters.
Susan explained:
Webmasters have confirmed the links are not being reported accurately in Webmaster Tools.
Forum discussion at Google Webmaster Help.
