Weird white line on the edges of my game icon

So I made this icon for a game that my friend and I are making. I uploaded it onto Roblox, and when I went to look at it, there were these weird white lines on the edges
image
So I went into my files and checked the dimensions of the image, and it said 512x512. Does anyone else have this problem? And is there a solution to it or will it go away by itself?

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I can only see them if i zoom in and most players wont notice if this is a game icon

Roblox automatically reduces the quality as per their capacity I guess , thus white lines occur due to low quality.

I don’t know exactly why , but that’s my assumption…

Or you might have saved the GFX in low quality