It's normal for feedcounts to increase and decrease - subscribers are
calculated daily based on who is actually polling the feed that day,
and partners who report us numbers. If someone does not fire up
their feed reader one day, they will not be counted. Likewise, if a
partner that aggregates users and reports them to us has errors or
does not report, subscribers are not counted from that service.
In this case, if Feedfetcher is not reporting all the numbers, we'll
check into it that's a mix of numbers from Reader, iGoogle, and other
sources so there could be valid reasons or a bug that those products
aren't reporting to us correctly.