The reality is that, this is going to continue to be an issue within UNA because it's a Quill related issue (their choice of text editor within their software).

Quill devs have been made aware of this issue, and, have chosen to ignore peoples requests to correct this and close out tickets that bring up this issue.

What the issue is, the Quill editor inserts

<p><br></p>

With each and every linebreak, incasing the BR html tag between an open and close PARAGRAPH tag. Thus creating the white space between each line of text. I don't know what they are drinking over there at Quill-land, but it's clear they refuse to lay off the booze.