Move multiple line markers to appropriate columns

I want to create a chart where I have 5 clustered columns, repeating 4 times(weeks). Each column(total invoices entered per user) has a error rate, which I would like to display as a line graph with markers. In other works, first column has its own line, second column has its own line etc. this spans the 4 weeks. When I create the chart now, ALL 5 the line markers are placed in the same one column. I can not move the line marker to sit on top of the column it is associated with. Any advice would be appreciated. Thank you