When I create sub-tasks from an issue, it is being created successfully, but the sub-tasks section of the page is not present.
Moreover, the sub-task is denoted as Project Name/PR-17 rather than Project Name/Parent task key/PR-17.
That sounds like you are creating tasks rather than sub-tasks. How are you initiating the "create" process when you create the issue?
More->Create Sub task
Ok, and when you do that, does it offer you a list of issue types to choose from? What is on that list? I'm just checking that you are definitely landing on the sub-task create, because it sounds like you're somehow not creating subtasks at all.
That list has only Sub-task listed.
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