Issue
The UI11 Process Flow is shown only for some users.
Cause
There are two UI Macro process_flow.xml which are conflicting and the one is used for that user for which the process flow appears green is the following:
https://<instance-name>.service-now.com/sys_ui_macro.do?sys_id=4bcb4b840a0a0b9f00ae822ff0cef724
Resolution
Disable the UI Macro for UI11 or rename it which should resolve this issue.