Here's what's indicated in our Jira data synchronization:

If a story has time logged against it in Jira Software, Jira Align will automatically create a child task on the corresponding Jira Align story with the same name as the Jira story, regardless of if task synchronization has been configured. This is to support roll-up reporting of the stories.

 This design may potentially cause confusion for users, as it automatically generates a task when time is logged against a story in Jira.
In the document, it is mentioned that this is to support the roll-up reporting of the stories. However, the customer believes it shouldn't support roll-up reporting of the stories and suggested changing that.