MS CRM - Duplicate tracking tokens when sending emails from workflows

I have recently helped some of our users set up several workflows to send emails. Now that these have been in use for a couple of weeks we have notic开发者_JAVA百科ed that each time the workflow runs, emails to different recipients are sometimes given the same email Tracking Token. This has resulted a number of emails tracking to the wrong Lead when their recipient replies.

For a workflow that sends the same email to 10 - 15 people most of the emails sent will receive a unique tracking code, however between 2 and 5 from the same workflow execution frequently have the same Tracking Token appended.

Emails sent using the standard send email functionality consistently have unique Tracking Tokens.

No custom code or 3rd party add ons are being used in the email sending process. We are running CRM version 4.0, and are yet to perform roll up 7 (we are in the process of doing that at the moment). |We have also disabled smart matching, and rely on the tracking codes.

Finally the workflow sends the email from an email template.

Thanks

Update:

Workflow Screen shot url: http://img515.imageshack.us/img515/4710/stackoverflowworkflowsc.png (I haven't been a member long enough to post the image)