All that shows is that there was an active decision making process. Every day, all around the world, there are aeroplanes that set off to a particular destination but end up somewhere else, be it for weather, delays, technical or passenger issues.
Maybe they couldn't get optimum levels, the wind forecasts were out or they had to re-route across the Atlantic. Or maybe DXB wasn't reachable initially but they thought it might be if they could make fuel en-route. I'd guess that as they approached KWI, the fuel predictions for DXB were below what they had decided as a cutoff point, so they went into KWI instead. No drama, nothing to see...