Depending on hte jpeg settings, it could be that there's a lot of jpeg compression going on when the picture is taken. If the editing done ot the picture is not that heavy, you probably won't notice this, but the heavier editing will tease out the lack of detaiil in the original jpeg.
Check that you are using the finest (lowest compression) jpeg setting possible. I take it that this is a "superzoom" type camera, in which case it would have a ver, very small sensor, and you might be asking too much of it in the circumstances.
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