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Possibly a badly rendered entity? Can see the obvious comparison between the Quartz. You've probably fixed this by now, but pressing F3 and A at the same time re-renders chunks and entities. Could be a possible fix.
ya, that did work for a bit, but, its back again same spot. exactly the same spot, i tried what you guys said,didnt work. then i went onto another world of mine, same thing, and another, then i created one, except, its acual blocks, quartz block. i broke them made new world again, same thing. all of them are superflat too. also i tried forge, and vanilla mc version 1.8 .i never saw anything like this with game code before. what should i do?
P.S. they are all at 0.0.0 coordinates or 1,1,1 or 10,10,10 or 100,100,100. this is a strange one. at 1000,1000,1000, they are not there,