Straight Forecasts in Line Chart

[SterreKapteijns]

Hi!

I've read about the possibility of creating time series forecasts in a line chart.

https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Visualizations/LineChart... 

When I add this functionality to my chart I get a straight line:

Is this caused by high volatiliy in the data? Can this be fixed?

Thanks in advance!

Kind regards, Sterre