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Charles,
Doesn't look like a debayering problem. That would give you wrong colours, but they'd be consistent over the whole frame. What you've got there is an odd gradient. I'd take the filter off for a start and see if that's causing the problem.
There are tools for removing gradients. Gradient Xterminator is one for PS. I use one of the tools in PixInsight. Gradients are quite common and caused by light pollution, imaging with the moon up, sky brightness variations, etc. Yours is a bit more colourful than usual.
Cheers,
Rick.
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