Knocking noise and middle seat that folds on its own

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your Palisade. The noise you're hearing may be from several different sources. One possibility is that the self-leveling stocks are making noise during adjustment. Another possibility is that you're hearing the ABS pump running a self-test. Lastly, you may be hearing your Palisade switching between port and direct injection, which can produce different noises. The middle seat folding on its own is definitely not normal. It could be a mechanical issue with the seat's folding mechanism. Since the seat is moving on its own, this could be a safety concern and should be addressed as soon as possible. Given that your vehicle is relatively new and still under warranty, I recommend taking it to your Hyundai dealership to have both issues inspected. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!