u/Apprehensive-Hat2691

I'm new to self-publishing, so forgive me if this is a dumb question. I put my second novel up for preorder recently, to be released on May 26th. I set the paperback price to $12.99, but the price on my actual listing says $19.99. Also, it says if you order the paperback, it won't be delivered until Dec 2. Did I miss something important when I set this up? Will it change when the book is actually published? Is Amazon just being a jerk? Any help is greatly appreciated.