Could you try the following and see if it works? Open a book (or Pocket article) with Bengali text and flip a couple of pages. Then exit the book and return to the book list. Do the titles display now?
For some languages, Kobo will only load the necessary glyphs from a sideloaded font if a book requires the characters to be displayed. It won't load them for book titles. But once the glyphs have been loaded, it will display the titles properly. I don't read Bengali myself, but I used to have this precise issue with a different script. It may be worth checking to see if that is the problem.
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