Note that using such an old version of the controls with new browser that has been released years after the controls release date is not supported and it is expected to face different issues in this case. If you to use the new browsers, please update to the latest official release of the controls and see how it goes.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items