Have you considered that the other site could be reporting wrong values ? Have you considered that both are wrong, the volume is not 1000 neither 200 for that period ?
Clarkmoody also reports every trade happening 6 times, so I'm pretty damn sure that it's Clarkmoody that's manipulating this. Incoming another pic:
The wall that disappeared with those trades was an 84 BTC one.
Their orderbook is fishy as well. Below a certain treshold, the volumes seem to be multiplied as well if you group them by for instance 1 USD: There is an order flashing at 432.68127 of 222.6118 BTC. If you watch the regular orderbook, you'll see this order flashing and flashing, totalling the BTC til that point to 500-ish BTC. If you then watch the orderbook grouped to 1 USD groups, the 200 BTC flashing causes the total to be ramped tup to 1600 BTC instead of 500-ish.
Anyway, lots of fishiness going on at ClarkMoody and I'd say it's safe to say that the information on clarkmoody is (intentionally or not) compromized. China followed MtGox movements, BTC-e did, and seeing the true value is not as high this might be partly because of clarkmoody reporting false figures.