Greedy, greedy, greedy. No, I'm not jealous.
No, just confused.
Run away ratings, and then like a switch turned off, none.
Very very confusing.
Not really. Amazon runs its storefront with cron jobs. Some have a higher priority than others. Depending on the volume of items in a cron job, it could take Amazon longer than normal to update new files, reviews, and ratings.
When a lot of stuff is happening on the backend, there seems to be anomalies like a surge of ratings and reviews appearing on the front end. The distribution of when those ratings and reviews were made is likely to be completely normal, but due to other things, their appearance on the storefront looks odd.