My makeup fades/ turns dark after a few minutes. For instance, I put a certain concealer under my eyes and it looks like it does the job well. But after a few minutes, it’s as if the concealer just changed color and it no longer covers the color, although I can still see the concealer right there! It hasn’t smudged or anything, if that’s what you’re thinking, because it “fades” in under a minute. What does that mean?