Principal investigator and user doesn't appear as user in investigsation, and doesn't receive notification e-mails

When the Main proposer (Principal investigator) is also the User of the experiment, he/she only appears as Principal Investigator in the Participants of the session. In the session below Katherine Fletcher should show as Principal Investigator and User, but only appears as Principal Investigator:

This is problematic because they do not receive the notification e-mails for their parcels as only the users receive them. In some cases, they are also the only user on the A Form and as of today do not receive any notification e-mail.

Is it possible to add these people as Users in addition to Principal Investigator?