Hey, ((((((Melody)))))),
You can get a job in high tech

(if you can find enough books)!!
I imagine it was probably something like the fan being loose. When you balanced it out, it probably slipped back to where it's supposed to be. It's probably still loose, but seated correctly, so it doesn't really show up now.
Wow!! A world-class muffin-maker and a

("Jill of All Trades"). I'm impressed
Hugs.
Barb