A little question about crude curve

any idea why the belly of the curve (mainly Mar-June) has come off so much today?

 

Nov-Dec14 spread previous close @ 5 , bid @ 2 and ask @ 7 now.
Dec14-Jan15 spread previous close @ 23, bid @ 19 and ask @ 25 now.
100 lots liquidity on both side of the spreads.
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This is a real aberration, not a quote problem, perhaps related to funds activity as drm pointed out.