It doesn't sound like you are doing anything wrong...
If the mission loaded like it normally does and it just went up and hovered it could be a gimbal drive error. We have heard of this happening and there is no way for Map Pilot to receive the error to report it. When this is the case it will just hover in place. If you manually landed after the hovering incident it likely caused a loss of sync in what waypoint was currently being visited.
Sorry to hear about the trouble. Please check your gimbal for obstructions and do a few test waypoint flights in DJI Go to see it happens there.