Different stats from different Adwords views

[mwrmwr]

I just started my first Google adwords compaign as a learning experience. I have one campaign and one ad group with one key word phrase. The ad (two rotating ads, really) started this afternoon. The Campaign Summary page shows 1,124 impressions and 11 clicks for the group. Clicking on the group name goes to the group page where it shows 566 impressions and 8 clicks.

Why the difference in impressions and clicks on the two pages?

Thanks,

Mick Ruthven

[FromRocky]

There is due to a delay on stats. Over time, I have learned that the campagne stats is updated first, then groups and finally the keywords.