Team members are still existing in the backend even though the Team Members checkbox is unticked?

Summary:

Issue encountered:
Team members are still existing in the backend even though the Team Members checkbox is unticked under the Copy Options when creating a project.

Scenario:
Project is created using the 'Create from Project' option and the the Team Members checkbox is unticked from an existing project with team members (Project Manager, Project Finance, Project Assistants, Line Manager etc.)

Expected Outcome:
No team members will be copied from the existing project in both UI and in the back end.

Actual Outcome:
All team members from the source project are still copied when checked in the backend but they are not visible in UI on the newly created project.