I just noticed that this happened this morning to me too. I was at
288, and now I'm down to 52. WTF?! Google has screwed up my
subscribers, first deleting a lot of blog followers (and not adding
them back in last month) and now this. It's taken a while for me to
get that many subscribers. I'm really burnt up with Feedburner. And
I can't find anyone to contact about it.