SliceCenter bug(?) and Roblox uploading assets with distortion?

Hello, I have a confusion concerning the use of SliceCenter.

I am using a 24x24 image as a border. I scaled it up to 96x96 for the sake of readability for the numbers:

This is the 24x24 as viewed on paint net:

And this is the 24x24 as viewed on a Roblox imageLabel with a SliceCenter of the numbers above (3, 3, 20, 20):

As you can see, the top and left lines on the border are blurred whereas the bottom and right lines are not.

It becomes normal when I change the SliceCenter to (4, 4, 19, 19):
image
See? No blurs.

Is this the supposed rule of SliceCenter? Or is this occurring because of a distortion with my image? Because this is how the asset looks on the Roblox page:
image

If distortion on Roblox’s end is the case, then what is the preferred size to upload? Is it based on 10s?

It’s important to note that paint net considers the top-left pixel (0, 0):

Does Roblox consider the top-left pixel (1, 1)? If so, that would make some sense, but I would just like reassurance and any clarification that you guys can provide.

Try using that same image but high resolution and it may fix.
I has 2x2 image that is checker pattern in the past where it was blurry since low resolution image is being scaled up.

[FIXED] Roblox just considers the top-left pixel (1, 1) and not (0, 0) like paint net.

The distortion of the Roblox asset in the library does not occur in Roblox places from what I can tell.