I made this Custom Texture for a package by downloading This One and editing it. However, when I change the texture in the Torso of the NPC it is oddly offset: 
Is there a way I can fix this?
You will have to revisit the actual texture and fix these oddities yourself, as they are caused by the image you uploaded. I flipped quickly between the two textures and I noticed that the texture you uploaded has a slightly noticeable difference in positioning. Open two tabs side by side of the textures you linked and click quickly between the two; you’ll notice the position differences.
I don’t notice anything. And if I do it is only by like one pixel.
The difference is very noticeable to me. That “one pixel” (which I’d say it’s actually around 5-10) is causing the offset issue. if your proportions are exactly the same as the original texture and don’t have that positional difference, you won’t receive this offset error.
Pay close attention to the screen.
And that what made the giant offset? I will try to perfect it.
I’m not quite sure, you’ll have to ask someone versed in retexturing for guidance. I’d assume it has something to do with the way the asset was retrieved or what the image editing program did to the image dimensions when it was coughed back up for uploading purposes.
If I move it by only one pixel it is way more off.
I fixed it. Apparently you need to stretch it out.
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It seems you downloaded the web preview instead of the actual texture. The problem with doing that is that the preview can be & often isn’t the same size.
In this case, the actual texture is 388x272, so the preview is a 420x420 image with the actual 388x272 texture in the middle stretched to fit (with respect to aspect ratio–so it only stretched until either axis fit).
So if you try to use this texture’s preview in place of the actual texture, it’s essentially been vertically squished as the process of generating it added a bunch of empty space at the top and bottom.
To get the actual texture, enter roblox.com/asset/?id=ReplaceWithYourTextureID into your address bar; you should get a file from this, and that’s the actual texture.
On Windows at least, you should be able to just stick .png at the end of the file’s name to make it recognizable as an image.
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