This is already a known bug, I believe it is somehow caused by Roblox’s 2D engine.
You’ll notice that if you’re images are their original resolution, the outlines will not be there.
Solution: Keep your images at their original resolution. Tutorial: How to fix the dark outline artifacting around your image guis
https://devforum.roblox.com/t/grey-outline-on-small-imagelabels/54035/4
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