Reproduction:
1) Click "backup now"
2) field backup-comment
3) enter
<p>pre-extension update</p> <ul> <li>Akeeba Backup Pro 4.4.0</li> </ul>
4) create backup
5) Click "manage backup archives"
6) view comment
7) comment listed:
pre-extension update Akeeba Backup Pro 4.4.0
The list is only properly being shown if after step 7 i toggle the editor, then enter the list information again.