I had similar issues last week with stickers not posting, miles not posting for 2-3 days. Leading up to today the AA app and seat map were showing configuration for a 757, even now 10 minutes before departure still showing 757, flightaware shows an A321. So my seat selection was based on the 757, the AC help desk was heavily suggesting that I take the exit row, but I was sure that the seat I had was another MCE with an empty middle.... nice IT AA.