Thank you! I didn't find the culprit in my Custom CSS but after removing and putting back a few codes in the Code Injection (Header field), I was able to find what caused it. I have no idea what that code did but it doesn't seem to have broken anything.
Is there a way to bring the price and the "add to cart" button next to each other? Right now, you'd see the price, then have to scroll down to choose the options, then scroll back up to see the updated price.