This is my first time using JIRA Roadmap with Story - Task relationship.
Actually I am not sure whether it's Advance Roadmap or just Roadmap. But I created it from this menu:

Let's say I have below:
I dont have any Epic, I only have Story and Task
TRN-01 is a Story set with Issue Links "Parent of" :
- TRN-02 is a Task
- TRN-03 is a Task
TRN-04 is a standalone Task without any Parent
When I generate the Roadmap and use hierarchy Epic to Sub-Task it shows me "4 Task WIthout Parent" .
Is it normal? Should it have some hierarcy since I set a Parent-Child relation on some of the task?