Natural Gas weakness compared to spreads

Updated
Natural Gas in seasonally slightly bearish, the dec16-dec17 spread is showing a lot of weakness compared to the spot price. I'm short from around 2.9 looking for 2.75 and we'll see from there.
Note
The Dec17-dec18 spread has me worried cause it is not showing the same weakness, but it is not liquid and maybe me just following the spot price due to market makers.
Natural GasNGASNGZ2016

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