Hi Hal Trask,
The common way to reorder items in RadMenu is using the Icons in Item Builder. Please take a look at the screenshot I've attached. Also I've tested with drag&drop and it works ok for me. No copying of items or other inconsistencies.
Please send us a video with Jing
to show the problem.
the Telerik team
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? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items.