Monito Offline Upload & Sell: Off
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Post a 100% crop.
It's not moire. Moire requires sharp lenses (plus a regular or semi-regular pattern at the right resolution and certain sensor characteristics). Out of focus blur is, by definition, not sharp.
From the way you worded your OP, it is possible that you changed your quality setting in the camera or in Adobe Raw.
Applying the free Canon DPP would be one way to separate the variables -- if it shows up there, then it is in-camera; if not, then look to Adobe Raw.
What you call "moire in the background" could be something akin to JPEG artifacts (yes, I know you are shooting Raw mode). You say it gets worse with more processing. That is how visible JPEG artifacts react.
Another possibility is posterization due to processing in 8 bits instead of 16 bits. It is due to a limited number of colours available, especially when the colour is mostly composed of one or two primaries or the other two primaries are equal in strength. I'm now thinking this is the source of the problem, since I see some posterization after I blew up your itty bitty pic, but I can't be sure without the original file or a 100% crop. It's great to have a small rendition of the whole image for context but additionally have a 100% crop for when the question is about detail.
Also, the (small) image is oversharpened. That may not be a factor with a 100% crop.
Post a 100% crop, already, please.
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