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Trouble with futures data

I have been trying to backtest some strategies that I've manually tested but I am having trouble getting the data from Quantopian to line up with the data from the exchange.

I cannot seem to find any pattern of where the discrepancy is coming from.

Am I making a mistake in the way I'm requesting the data? Or is there a reason that the Quantopian data varies?

For example contract ESH 2017, 2017-01-04

Quantopian quotes:
open: 2243.75
close: 2250.5
high: 2255.25
low: 2240.25

Both CME and my Brokerage quote:
open: 2252.75
close: 2264.5
high:2267.25
low: 2251