There is an issue observed in XD when the shapes are getting edited. Once double-clicked on shape, the edit shape points get activates (which are generally used to edit the shape). The top left edit point is always auto selected which is causing problem. Please comment on this issue and rectify.
Thanks for reaching out. Could you please share more about what problem you are experiencing while editing a shape? A small video of the workflow will be very helpful. We'll also need the version of XD and OS. We'll try our best to help you with it.