Importing a texture and it changes the colors? How to fix?

Hi there!

So I draw a nice ninja and imported it into UE so I can make a sprite, but it messes up some colors on the picture. When I click reimport, the colors turn to the right ones, but as soon as I click save they break again.

This is when I reimported it:

This here is after I clicked save:

How do I fix this? Thank you!

I changed Compression Settings to DXT5 and it works better