Requirements - Requestor List full charged

Hello ! 

Iwhen etering a requirement: when a user (external project manager) is linked to only one project, the project is initially selected but the requestor list is loaded with all the contacts, including those who are not assigned to the project. (in case the user has multiple projects, the requestor list loads correctly depending on the selected project) - (NB, the "creator" access was opened to the external project manager on the requirements)

Is this normal behavior?
Thanks a lot !