Perfect! Thank you so much, it looks great!
Thank you for your response. Here is the screenshot of the main body text of one of my posts (this is the live preview, I haven’t published with this theme yet). Here also is a screenshot of the post excerpt on the main page, which also has the line.
I recently tested out another theme to see if the same issue came up and it did appear to happen in the other theme as well.
Additionally, I checked some of my older posts before the new WordPress block format was implemented, and these also have lines between each paragraph (so, it happens even with the traditional editor and seems to be associated with spacing?)