As seen in the image, once when the world is loaded, there is a large lag spike as it is creating the item frames and redstone dust in my case, and creates 9 stacks of each for each item frame on the wall in a specific area. This is a map I have been working on and it didn't happen at all on the other side of the other side of the map that is 100% identical.
Left image has 12 item frames, thus making at least 216 stacks.
Related issues
duplicates
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Good news! This isn't a problem in 14w18a! Instead the map is unopenable if there are any item frames at all! I think this might be a step in the wrong direction. 😞
kumasasa
14w18b is out just now, please retry with that version.
If it still duplicates frames, please leave a note in MC-45568