Tile Map Collisions

I'm having some trouble with this. Here's my setup:

new t2dTileLayer() {
      LayerFile = "~/data/tilemaps/untitled.lyr";
      canSaveDynamicFields = "1";
      Position = "12.000 12.000";
      size = "24.000 24.000";
      Layer = "1";
      CollisionActiveReceive = "1";
      CollisionGroups = "1";
      CollisionLayers = "1";
      CollisionPhysicsReceive = "1";
      CollisionMaxIterations = "1";
      Immovable = "1";
         mountID = "2";
   };
   new t2dAnimatedSprite() {
      animationName = "walkDownAnimation";
      config = "PlayerDatablock";
      Position = "1.500 7.500";
      CollisionActiveSend = "1";
      CollisionActiveReceive = "1";
      CollisionGroups = "1";
      CollisionLayers = "1";
      CollisionPhysicsReceive = "1";
      CollisionPhysicsSend = "1";
      LinearVelocity = "0.000 -1.000";
         mountID = "3";
   };

The map collisions look weird though:
http://img9.imageshack.us/img9/9786/tilemapeditor.png

The collisions aren't working. How do I fix this?