Hello Oskar ,
Thank you for reporting this issue.
We sent you an updated version of the RadChart
yesterday, which we would like you to try as well. Hopefully, you will be able to reproduce it with it. We will be investigating the problem in more detail and we will try to fix any issues related to this behavior for the upcoming release due at the beginning of next week. In the meantime we will appreciate any other hints that you may have.
Thanks again for writing. Please contact us if you experience the same issue using the new version of the RadChart
the Telerik team