Sony ereader loads 274 "books" for every book I load

[Gregg Bell]

It's the PRS300. I just put two books on there and it says I have 548 books. It does break down the two books (which are very short--like only 20k words each) by title (it shows each book as 274 books) and I can read them, but it also breaks them up into a lot of divisions, maybe by chapter.

I've sideloaded the two books manually and loaded them via Calibre. The results are the same either way.

The thing is it takes about twenty minutes for the books to load and also about twenty minutes for the books to load when I turn on the ereader. (It's like it's loading 548 books!)

There have been times it has loaded and opened properly. But then this sort of thing happens.

Any ideas or is this thing just impossibly obsolete?

Thanks.

Update: There are actually 548 books on the ereader! At first I thought they were just chapter headings but no, there are actually 548 books there (all of the same two!). That's why it's taking so long!

But what would cause so many books to be loaded?