Issue with Reading Books on Windows

Why do both Paperback and Bookworm display an entire paragraph as a single “line”? When I use the up and down arrow keys, I expect to move line by line, but instead the navigation jumps between whole paragraphs. In effect, each paragraph—regardless of its length—is treated as one continuous line, without normal line breaks flowing across the text. This makes it difficult to read and navigate through the content smoothly.