How to prevent a Table Reports's Summary Table's Bar Chart Labels from displaying ....

When I click on the chart button in the summary table at the bottom of my table report, it displays a bar chart as normal, but it is also displaying span class='wrapper' style='display:inline-block;'>User'sName</span .  The report is grouped and sorted by a list user field.  How can I correct it so that it only displays he users' names on the chart axis?