Problem with stone forts

I have successfully added some stone forts to the Teutonic campaign strat map. They play just fine on the battle map.

Problem is, the computer is rejecting any more additional stone forts I place on the map in the descr_strat file.

I know that the terrain is perfectly suitable for placing a fort, since the imperial campaign loads just fine. It's just that when I load a new game with a new fort, all of my other placed stone forts dissapear from the map!

It's like I'm not allowed to go over a certain amount of forts. If I don't add in any new forts, the old stone forts I put in are there, and everything is fine.

But if I add in a new fort anywhere on the map (and they are placed validly, by the way - the imperial campaign loads just fine), all of the stone forts dissapear from the map!

I have never had this problem in any of the other Kingdoms campaigns when placing stone forts.

Does anyone know what the cause of this might be?