Hello Rohit,

Would you please elaborate more on the steps for reproducing the issue and add some details on the used browser and machine? Here are some screencasts demonstrating the proper behavior of the Gantt Task template online demo in various browsers:

• Google Chrome - http://screencast.com/t/mL3DyUiczT9R;
• Mozilla FireFox - http://screencast.com/t/gcmJknzh;
• Internet Explorer - http://screencast.com/t/LTj7ygNz;
• Microsoft Edge - http://screencast.com/t/nysTihJpuzu;

A screencast would be greatly appreciated.

Regards,
Peter Milchev
Telerik by Progress

Hello Peter,

I used Google Chrome and found the error. When you drag and drop child element of one parent to another parent then the previous parent of child gets distorted.

Take a look of the screencast for more details: http://www.screencast.com/t/FosUHLkDMurO

A solution for this will be helpful for me.

Hello Rohit,

Thank you for the screencast and additional details.

We were able to reproduce the issue. It seems that the issue is does not appear when rowHeigth is not set. We have logged this bug as a GitHub issue which you could subscribe to and get notified when the bug is fixed. 

As a small token of gratitude for reporting this bug we have updated your Telerik points.

Regards,
Peter Milchev
Telerik by Progress