Analytics & Wizzley Statistics WAY different?

I noticed this on a smaller scale last week, but thought there must be delays somewhere. But now I've seen a big difference.

Looking at the individual statistics for a page, on the pie graph, the numbers are a LOT higher than on Analytics, even accounting for different day rollover times. 

I just had a wizz article go viral and got about 6,000 unique views in the first day according to Wizzley, but Analytics says it only got about 1,000 views [and with nearly 2,000 FB likes on that first day, I'm really doubting the Analytics!]

Just wondering if the UA code is being inserted correctly all the time or if there's another explanation for this?

Ok thanks Simon.

Still a bit confused though - the total visits on my page list match the amount shown on my pie graph. 

Since those only show 7 days and above, what do you mean by 'daily stats'? Is that here on Wizzley or are you referring directly to stats on Analytics? 

I still find it a bit weird that there's a difference of over 4,000 views.

Ooops - for some reason GA seems to be a day behind. When it rolled over, it showed a peak with thousands of hits. According to when I published it (three hours after rollover time two days ago) I'm quite surprised by this. I assumed GA simply updated for the last 24 hours.