When you write a narrative about an existing visualization, sometimes the way that the visualization is set up is the culprit for the issue. For example, if the numbers are different in the narrative than in the underlying visualization.
In order to troubleshoot the issue, we suggest that you create a new sheet and a table with the same measures and dimensions, then write a narrative about it, using our hidden sheet technique.
Usually, this technique uncovers if the issue is the data or the visualization. Most of the time it is the way that the visualization is set up and it fixes the issue when you write a narrative about a hidden sheet on the dashboard with the same measures/dimensions.