Are all 243 books on the device? Some of the books not being on the device is the simplest explanation for the discrepancy.
If all the books are there, the most common reason for missing shelves is the driver configuration is missing the shelf options (see PeterT's post above) and the metadata management is not set to automatic. The metadata management option is in the "Sending books to device" page of the calibre preferences.
If these are set correctly, it should work. To see why it isn't, I would need a debug log. To produce this, restart calibre in debug mode, connect the device and wait for the initial jobs to run. When they have finished, close calibre and the debug log will be displayed. Post that, or send it to me in a PM.
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