Names no longer showing on Contract Approval notification emails

Summary:

In a contract approval notification email the name of the submitter is included in the Email from field. However, in some of the approval emails the name of the submitter is not visible.

Content (required):

Previously, When an approver received a notification for approval the name of the submitter displayed on the From field of the email. Example:

From: Jane Smith <example@oracle.com>

To: Tom Smith

Subject: [Partner] Action Required: Approval of Contract XXXX for Supplier from 12345.

For some of the emails the submitter's name is no longer showing up in the From field of the email. Is there an issue or bug that could be causing this?