Whenever I copy and paste one costume into another costume and I try to change the size, it changes the way it looks!
Somebody please help me.

I'll check posts in 3-4 hours.

It sounds like you're encountering an issue when copying and pasting costumes in Scratch and then adjusting their size, which affects their appearance unexpectedly. Here are a few tips and steps you can follow to address this issue:

Understanding the Issue:
When you copy a costume from one sprite to another in Scratch, you're essentially duplicating the image data. If the original costume and the destination sprite have different sizes or resolutions, resizing the copied costume can lead to distortion or unwanted changes in appearance.