Snapshot timeline confusion

Hi all, I have questions about the snapshot timeline. So I have it set for snapshots every hour. When I look at the timeline via dashboard and clicking on the photo, it is always missing the last hour snapshot until the next one is taken. For instance, it will have one for 3:00 AM, every hour to say 8:00 AM. When I check at say 9:30 AM, it is missing the 9:00 AM one UNTIL the one at 10:00 am is apparently taken and then it will show the 9:00 am one, but now, not the 10:00 am even after 10:00 AM. Why is there a lag in showing the last snapshot which I know was already captured as I'm checking well past an hour after it has occurred? Also, the time display on the snapshot picture on dashboard is very confusing. When you open dashboard to show the picture it apparently last captured, it may say something like 23 minute ago. After you check the timeline and go back to dashboard, it will now say 2 seconds ago but it has not been the point in time for it to capture another snapshot so what, for example, does 2 seconds ago mean?? Does it mean the time after which you went and looked at the timeline and has nothing to do with time of photo that is actually displayed there?? Very confused on this as well.