I have a theory that if everything was pixel perfect, centered, perfectly aligned and looked the same, the thing would look too sterile. There's basically a perfect world, written down in books and texts that is being taught to students and there's the real world. In many areas, these two do not match and the above image is the result of someone's text book world view not matching the real world.

Could the discover store have a better UI? Yes. Will a centered, down-anchored, pixel perfect button make it better? Subjective.