Hi Kasim,
The bug at hand has been resolved in the end of 2017 in Kendo UI, meaning that it was included in the 2018 versions of the UI for ASP.NET AJAX. Can you, please, confirm, that you are not using an earlier version of the controls? If not, can you send me the setup you are reproducing the problem with, so I can examine it further?
Regards,
Vessy
Progress Telerik
The issue is within Kendo UI and could be tracked at https://github.com/telerik/kendo/issues/4753