Before I start, these aren't my cupcakes. I bought them from a shop that recently opened, and, well... They weren't GOOD!! They weren't even meh! And I couldn't figure out what the issue was, and it's bugging me. They had a really strange texture... Spongy? Too wet, but not moist like cake should be. And they almost had an oilyness to them that I've never tasted before, and were a bit slick tasting on the tongue. What would cause this kind of texture issue?! I've never encountered it before in my own cooking. TIA!