Yeah but the basic problem wasn't that you can't capture it, the base problem was that its not attackable at all... You have a correct view with a red residence and a attack button. So its correct transfered.
If the other players if aster than you, you should normaly get the residence reloaded after a try.
This map is one of the first tries to get an better damoria castle map battlefield.
So also there, if you get informations of an area (like now) you have to reload the area or (in that crusade case) informations will reloaded automaticly after 60s when you move the map.
Im not sure what there is happening at your end; but the basic problem is solved from this thread here. Maybe you find another problem - but i dont't want to mix that too much.
Its again an area which is on an border (25x25 sequences and you have a Y 50 coordinate) - im quite sure that there could be still a problem; but in most cases, all users had the same problem - i don't do that to annoy you.