Can we clarify what changes a permissions scheme when applied to two identical projects?

[Spencer Ferris]

For example if a project is created from the template of another. We have found that even with identical permissions the respond differently. So when trying to change a due date for example you can in the one project but not in the other. The only way I have rectified this is to reapply the permissions scheme to project and then get the user to refresh their system.

[Trudy Claspill]

Hello @Spencer Ferris 

Welcome to the Atlassian community.

Permissions within Permission Schemes can be allocated to 

Project Role

Application access

Group

Public

Any logged in user

Single user

Service Project Customer - Portal Access

Group custom field value

Current assignee

Project lead

User custom field value

Reporter

If you are noticing differences in permissions, have you reviewed how the permissions are granted and whether or not the user is in the requisite recipients?

Have you tried using the Permissions Helper when this occurs to determine why a user does or does not have a specific permission?

https://support.atlassian.com/jira-cloud-administration/docs/use-the-jira-admin-helper/