How did the book get onto the device? The reference to "kobo device plugin" suggests you are using calibre.
I general, what you see in the title is what the title is in the metadata in the book. And if you are using calibre, then it will be whatever is in the title field in the library.
Other than that, it could be a metadata plugboard setting the title. But, if that is the case, it suggests an error in the plugboard, and I would actually expect all books you send to the device to be called "<Title>".
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