On servers when you throw black ink sacs, have unlimited and do not stack or are picked.
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here is the bug: http://www.youtube.com/watch?v=h_rVXPpVPAE&feature=youtu.be
It is actually a duplicate of MC-118, I've been able to replicate what's shown in the video.
Dye a dog collar with an ink sack, then you get a bugged item. This will be fixed in the next version of Minecraft.
Can't reproduce? I threw a bunch of ink sacs on the floor, which all appropriately merged stacks. I picked up the same number I had thrown out.
Any more clues as to what the issue is?