Use current project roles or warn administrators about the creation of new roles.
When a CSV import defines a new project or you create a new project during an import from an external system (Github, for example), the "Developers" project role is re-created when it had been renamed or deleted earlier on. The administrator is not informed of so by any means.
- Rename or delete a default project role;
- Import a CSV file that defines a new project (could contain just the project name, key and an issue summary); or create a new project when importing from an external system;
- Notice the default roles are re-created;
At this point, there's no workaround nor fix available for this.
You can check for projects created during an import, which will add this role, by searching JIRA's logs with the below regular expression.