The last time I looked, Logseq didn't have an easy way to just write a paragraph of text that isn't in a bulleted list. You could have headings and bullets, but not a heading followed by a paragraph, for example. Not sure if that's changed.
AFAIK this behavior is part of Logseq's core functionality. There are some settings you can change as a workaround, but it's purely cosmetic. The source markdown files still have every line starting with a hyphen.