I am trying to add a bitmap sprite to my project. Here is the original:

But whenever I click off to something else the glitch happens:

How do I stop this from happening? It's messes up the look with the rest of my project, because my project uses pixel art.

Copy it before t glitches, then paste into vector. I'm not sure though.

It happens when you try to resize it to a resolution that isn't a multiple of the original. For example:

15x15 25x25
100x100 120x120
300x200 350x233

So, Scratch tries to snap the pixels and horribly fails.

Fix it by importing it at probably x2 or x3 resolution, and not moving or resizing it inside Scratch's editor, because Scratch's editor is horrible and horribly fails.

This isn’t a glitch but it is really really really annoying

try making the image bigger.

Make sure the sizing is pixel perfect. If you don't have it at a 1:1 ratio (one image pixel per canvas pixel), the image will be stretched or contorted. (It's hard for me to describe.)

What's probably happening is that you're basically resizing the image. For example, inserting an image of size 16x16 onto a 24x24 space will stretch the pixels. You have to make sure you're putting that image on a 16x16 space so that it doesn't stretch.