You selected the basic economy option, not Economy. Select Economy for the ticket and all the economy seats are the same. Basic economy makes you pay to select a seat, only get one carry one or personal item, and board in group 6. Basic economy is cheaper that that is literally why.
Go through the process of booking it again and select economy and you'll see.
I'm having issues posting a picture. I'll update in a few. I had to do imgur.