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Noise reoccurring when flattening a large document

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I tried some night time shots this week and ended up stacking  4 or 5 raw files together to benefit from noise reduction. I then flattened that image and applied multiple adjustment layers till I got the result I was after but of course the file was quite large (that's why I can't attach it here}.  My problem is when I flatten that image a lot of the noise comes back into the image.  Has anyone else experienced this? Could it be a workflow problem? 


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I have also found that some noise comes back when using a live filter and flattening.  No noise comes back when just using the noise filter on it`s own and flattening.

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