Houses of Westeros by jammyme

My friends and I love the map. I've even been working on a scenario for it (currently published, under 3rd revision).

However, it is a very frustrating map because there are a ton of transport bugs - ship never moves, or units still on ship, or both. It happens often on this map, whether we run it normal or as a scenario. It's always been the case (I've been a member since last December), while every other map I have ever played has never had so many bugs on a consistent basis. It's to the point that we are getting sick of playing it. We really like the map, but the bugs are frustrating.

Does anybody know why a certain map may have these sorts of problems while others do not?