Looks like someone might have sent a large order; it was a ~1-2% move, so I'm guessing you were 50-100x leveraged?
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Premiums can move, and this was a long dated (September) future. You can see a lot of volume trading at that time--it looks like there was significant sell volume. While leverage can help you put on a larger position it's also riskier, and really high leverage especially so.