Why is Carlsen so weak against 2500-2600 players?

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Surely, yesterday's draw in the Carlsen-Batsiashvili is the top news from round 1 of Qatar open, but I guess, that many of chess players could predict such a hard start of Carlsen. It's simply unexplanable, why he is so "weak" against 2600-around players (it happened so, that even against 2500-around). I thought, that on the top level such problems should not exist, but they do!