I don't understand what the story is with this chart. I am seeing bearish volume and bearish closing candles but very bullish CDB volume? This chart is the Canadian dollar futures , shortly after the GDP report for Canada. What is holding the market down ?

Spikes in cumulative delta are caused by market orders. Your chart indicates a large amount of aggressive buyers lifting a larger amount of resting offers, causing a muted response in price (look up cumulative delta divergence, your chart shows a textbook short term example). If you take a look at what happened in the 1.5 hours following the price action on your chart it sold off another ~45 ticks. Fundamentally I have no idea what caused the sellers to do this but from a technical standpoint the last resistance of 0.8875 was broken by that move, maybe liquidity sensitive (institutional) traders covering their loss into the correction?