Why are likes on my photos disappearing and reappearing?

[ruby11]

I get the notification for each person liking my photo when i first went on to the photo there were 10 likes which was the same as the notification.Then later when I checked the photo again it said 10 likes still but when i clicked to see who liked it there were only 6 names, then later it changed to only 6 likes on the photo- so i thought people may have unliked it, but then when I check again later all 10 likes (and all 10 names) are there again. Why is it doing this? I deactivated my account a couple of times in the last month, could that be causing it?

[abraXus]

facebook is full of glitches... the counts are never accurate... keep in mind that people deactivate and reactivate their profile all the time, and some profiles get deleted for spamming, promoting, creating fake accounts... that all affects the numbers....