Yes. Homepage -50% Some inner pages -70% Competitors Homepage -30% Maybe all likes not originating from the page were deleted? For example: Likebutton in widget on other sites "likes" example.com/widgets
Back in September Facebook began removing fake Likes (http://mashable.com/2012/09/27/facebook-fake-likes/). Even big name celebrities like Lady Gaga lost tens of thousands of Likes so it's not surprising to see happening on a smaller scale. Another reason why Likes only mean so much!
reduced like status is because people realize how bad your page is. it is an honest calling to made a better facebook update status post. make sure your post have correct grammar, and interesting status. you can communicate with your fans for a stronger bond.