The only case where this should happen is if text is formatted using the Preformatted style from the styles drop-down list in the HTML editor.
Could you post a screen dump of your HTML editor showing your problem behavior?
Joseph
Text editors
Auto wrapping text in HTML editor
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។