I am using the Kanban board. I made an Epic and then made child tasks for each epic. For those Child tasks, I made additional child tasks (grand-child of Epic). For these tasks, I want to make additional child tasks, but the child button is not available on the Grand-Child tasks. I'd be super surprised if Jira only allowed 3 levels.
Is it the template I am using? Some setting I need to change? I am new to Jira, so I haven't done any configuration with task types and such. I'm using the free version, do I need to upgrade to have more levels? Any advice is much appreciated.
Here's is the parent with it's sub-task below that doesn't have the child button.

