What are these and how do i remove them?

The black lines, i thought they were paragraph breaks at first appearing after i placed *** but they’ve started appearing in a few random locations like in this picture. Sorry I’m pretty new to this whole thing and the help would be appreciated

It looks like paragraph borders, but it is hard to say for sure without access to the file itself.

Divider lines, applied as autoformat when you type a row of “divider characters” on a line (e.g. “—” or “===”) will be inserted as a “bottom border” property to the preceding paragraph. To remove, see the Format - Paragraph dialog.