Problems...

[NFMLH2]

Every time I changed one of the stage's portrait in the stage selection every portrait becomes grey and glitchy... Why does this keep happening?

[Vortoxo]

What is the file size of the portrait.

[ABloodyCanadian]

Look at the normal size of the portrait, and take a look at the one you made. Are the sizes for both proportional? If the original size is like... 500 X 500. Is it the same, or proportionally the same? If not, you'll get glitchy textures.