Your "test.odt"
has two paragraphs
(both with "Paragraph Style: Default
").
The first paragraph has the "Character Style: Default
".
The second paragraph has the "Character Style: Emphasis
",
(Calibri Italic 12pt).
That cannot be changed with “Clear Direct Formatting”,
but you can apply the correct "Character Style: Default
".
Does it also occur with a newly opened empty Writer document
via menu "File → New → Text Document"
?