I'm having problems with grid's rowDragAndDrop feature. While application is running on a slower machine, grid wont pick up the right row while dragging. I will include an example which shows (console.log) which row was targeted by native "mousedown" event and which row was picked-up by "rowDragStartHelper" event as the drag item.
As I said this happens on slower machines so to fully recreate this problem you will probably have to set the browser performance down like I did (chrome: devTools -> performance -> CPU throttling -> 4x slowdown).
I also prepared a video example where I explain and show the problem. This video is 3 minutes long and therefor to large to send in attachment, thus I will upload it to a free hosting site where you can download and examine it.
I hope that I provided you with enough material to validate this issue.