Reproduction: 

• online demo - https://demos.telerik.com/aspnet-ajax/treeview/examples/functionality/draganddropnodes/defaultcs.aspx 
• code:

  <telerik:RadTreeView runat="server" RenderMode="Lightweight" ID="RadTreeView2" EnableDragAndDrop="true" EnableDragAndDropBetweenNodes="true">

Workaround from admin: Use the following OnClientLoad client-side event handler for the RadTreeView

function OnClientLoad(sender) {
    if ($telerik.isTouchDevice && Telerik.Web.Platform.android) {
        $telerik.$(sender.get_element()).off("scroll")
    }
}