After cloning, activity stream shows differently to the source instance. The user who created the comment and also the time of the comment shows differently from the source instance.
This is because the activity steam and history of the record builds from the sys_audit table. When you request a clone, checking the option "Exclude log and audit data" deletes the sys_audit table.
When you then view the record, it finds the journal fields in sys_journal_field but no audit for that record. By default, it will then use the name of the record creator (created_by)
In the following example, you can see in the source the comments and updates were by Bow, Fred, and Abel. However, in the target instance because Audit is not copied across, it uses the created_by user and the creation time of the incident for comments, and updates all by Abel.
Peform the clone again and uncheck the "Exclude log and audit data" option.