Sprites warped/not sliced on android builds, fine in editor

Note: possibly related to auto slicing sprites from script - see this question and answer here > http://answers.unity3d.com/questions/1113025/batch-operation-to-slice-sprites-in-editor.html#answer-1113065

I am working on little project on android, where sprites are assigned through code when prefabs are spawned at runtime. It grabs a load of textures from resources, then it takes certain sprites and assigns them at random to a prefab thats instantiated, and animates through a spritesheet for that particular sprite. The code works like this:

         private Sprite[] spriteArray;
         private List<Sprite[]> spriteArrayList;
         private List<Sprite> backgroundList;
         spriteArrayList = new List<Sprite[]>();
         backgroundList = new List<Sprite>();
 
         for (int i = 1; i <= 125; i++) // theres 125 sprite characters!
         {
             spriteArray = Resources.LoadAll<Sprite>("Sprites/Sprite (" + i + ")");
             spriteArrayList.Add(spriteArray);
         }
 
         for (int i = 1; i <= 178; i++) // theres 178 tiles!
         {
             backgroundList.Add(Resources.Load<Sprite>("Tiles/Tile (" + i + ")"));
         }

And then a random selected sprite is assigned when a prefab is spawned like this:

     void SpawnSprite()
     {
         int random = Random.Range(0, spriteArrayList.Count - 1);
         float randomX = Random.Range(camTopLeft.x, camBottomRight.x); // somewhere within limits spawn the sprite
 
 
         GameObject newSprite = Instantiate(SpritePrefab, 
             new Vector3(randomX, camTopLeft.y, -1), 
             Quaternion.identity) as GameObject;
         SpriteAnimate newAnimate = newSprite.GetComponent<SpriteAnimate>();
         SpriteMovement sM = newSprite.GetComponent<SpriteMovement>();
         sM.Speed = sM.Speed * level;
 
         newAnimate.SpriteSheet = new Sprite[spriteArrayList[random].Length];
 
         newAnimate.SpriteSheet = spriteArrayList[random];
     }

And in the editor this works no problem, however on device, specifically a Note 4, this causes graphics issues. Some sprites will show entire sheets instead of just a single sprite like intended, and some of the "splatter" sprites - which are left behind when you destroy a sprite - end up being stretched improperly. This looks like this:

I am kind of at a loss of where to start trying to fix things, but thought this must be a bug related to reassigning sprites at runtime, from resources. This is hard to diagnose considering it only happens on the device. I'll be testing in AVD here in a moment, but I'd bet the same result happens! Anybody know whats going on?