When I fuzzy select a section of an image, like so:
Cutting it works fine:
But when I paste it in I get these gaudy stripes of grey lines all throughout the image:
Zooming in, I couldn't see any discrepancies in the way it has selected parts of the image. According to Reddit, I should alter how the layer blends downwards, so I tried changing layer modes including the composite space, composite mode, and blend space. I have tried changing selection attributes such as Anti-aliasing, Select Transparent Layers, and Sample Merged.
All to no effect.
How can I paste this in without having said grey lines?