Report showing multiple-assignment tasks in chart view

Hello,

We recently noticed that one of our Task Reports, which is set as a chart view grouped by assigned user name, does not display tasks that are assigned to multiple users under each of their names - it only shows up under 1 of them. For example we have Jen, Steph, and Laura all assigned to 1 task - it is only showing up for Steph when selecting her name on the chart.

Is there a way to have the task visible on all assigned users lists? We use this for resourcing (alongside the Workload Balancer) so it is throwing things off a bit for us.

Thank you in advance :)