Roadmap items not showing in Timeline View

Document ID : KB000096805
Last Modified Date : 12/06/2018
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I am using the roadmap module. In the Grid view, I have 38 item, in the Timeline view, I only see 34 items. How could that be?
Only the roadmap items that fall within the start and finish dates appear on the timeline. 

To configure the start and finish dates you need to press the details button on the Timeline View


Enter the start date and the Duration. The Duration will determine the finish date of the Timeline for your Roamap. Only items that start and finish during the period that you define in the details will appear on the timeline view.

Additional Information:
This feature is documented in the roadmap here.