Does this happen often? Is the impression data sometimes delayed behind click data?
Welcome to WebmasterWorld, DavidB_REE!
This is not particularly unusual - as the stats for impressions and clicks are not (necessarily) updated at the same time, or with the same server delay.
On the other hand, if you look at the date range of 'yesterday' (at least assuming you're three or four hours into the current day), or earlier, the stats should be fully updated.
(By the way, AdWords stats are reported in Pacific Time.)
AWA