Charts stop plotting data error bars after a certain number of data point selected

In the attached document is a timeline made from a scatter chart. Error bars using custom values are used to show the length of each task, however I can't get the chart to include error bars for the last 2 data points (tasks).

Anybody have any ideas? In my experience excel charts can act funky if they are complex and/or have many data points.

Thanks for the help!
Jason