Hi Kalle,
We regret for the inconvenience caused.
We are unable to reproduce this issue. I have attached one simple sample. Could you please modify this sample which can reproduce the issue you had mentioned, which would help us to analyse it better?
http://websamples.syncfusion.com/samples/Chart.Windows/F62956/main.htmThanks for your patience.
Regards,
Rashidha.