if , as you say , it is only an issue with one specific laptop, & that the books are OK when sent via a different PC, then try backing up your calibre library then uninstalling and reinstalling calibre. you could also try setting all calibre preferences that are to do with send to device back to default, before you try that, just in case you've somehow messed up a preference and are e.g. putting strange characters into the book title
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