No burnup information

I'm having trouble with a Burnup chart. We have work items in the sprint. This will be the 3rd sprint of the project. The first (current) is displaying ok but not the next two. The 2nd sprint isn't showing any 'Total Capacity', Planned work, or expected complete. The third spritn isn't showing anything at all even though they are work items assigned to that sprint. We would like to display the total capacity for that sprint so we know if we over load it. I've tried playing around with the query but it doesn't change the chart at all. Also before messing around with the chart I did kick off the datacollection jobs.

We are using RTC 4.0.

Thanks for any help!