I have seen a similar post where problem is observed.
https://www.jqwidgets.com/community/topic/treegrid-jumps-on-first-click-in-chrome-and-ie/
My whole team can see the issue, please try again and you will be able to see the issue on chrome on your website
https://www.jqwidgets.com/jquery-widgets-demo/demos/jqxtreegrid/index.htm#demos/jqxtreegrid/defaultfunctionality.htm
On page load, click on “Andrew” and you will see it scrolls the page down but it does not do that in firefox.