FB Likes, problem with counting

Hi folks.
I'm having troubles in my fanpage. I had 182+k likes, today in the morning I had 180+k, again this afternoon my likes back, 182+k, but now again they're 180+k

So it's a 2k+(-) in these 3 days. What's the problem,is this any bug?
Sorry for my english

Probably not to worry about. I experienced them recently.