I am currently managing a software product. I am using scrum/agile. The problem that I am having is that I am unable to create an accurate burn chart, because the backlog keeps on being updated with new items.
For example, a typical scenario that tends to happen is when a item is begun, and during the sprint it is discovered that the item is underestimated leading to the item being split into more backlog items leading to my burn chart to be inaccurate.
How do I handle situations such as this?