Rollup not working in projects created with a Project Template

Rollup not working in projects created with a Project Template

Hi per your instructions Roll Up Using Gantt Chart | Online Help | Zoho Projects

I should be able to roll up the dates for subtasks- tasks-milestones

But when I create a project using a project Template I've created, and I enable the roll up function it is not updating the dates for my milestones and tasklist