Anonymous reply to bug links to wrong reporter

[archemedia]

1. I have a bug which is reported by a certain user.
2. I add a comment.
3. The user gets an email which contains a link to the bug, example: http://mydomain/mantisbt-1.2.19/view.php?id=2146
4. Clicking this link opens mantis in anonymous mode.
5. The user now adds his comment to the bug.
6. The newly created comment is linked to another user! When I look inside the table 'manis_bugnote_table' I can see that the reporter id has a value.

My question:
- Where is this value set?
- What should this value be in case of anonymous viewing?

Any help much appreciated,

Dany