I was playing with commands. I see the wood IDs, and that acacia wood and dark oak wood have different ID (162) than the other trees (17). And the technical name for the oak tree, etc is "minecraft:log" and acacia wood and dark oak wood one is "minecraft:log2". For the wood planks it's fine.
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is duplicated by 1
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Intended.
The 16 possible data values of the log #17 are used up by Oak, Spruce, Birch and Jungle wood , so that a new block was created for Acacia and Dark Oak. See http://minecraft.gamepedia.com/Data_value#Wood
That is true, but this is not a bug. The remainder of the #17 are sideways logs, so if you place 17:4 you get sideways logs. Leaves also need to decay.