Interactive Chart - Different presentation than the data suggest

[Robinvm]

Hello community,

I'm busy with Challenge 76 right now and I'm not really getting anywhere with the Interactive Charts. I have done the calculations and now I want to create the chart.

Unfortunately the line chart does not show me the data as I expect it....

What is my error?

Thanks a lot

[Robinvm]

It is solved. There must not be any Njulls in it.