To allow for height adjustment of the table, the leg design requires a very small amount of clearance between the tubes so that they will easily slide past each other. It is this small clearance that results in the slight wobble. Some side to side movement is normal and will generally be more noticeable the higher the table height. As far as the prong not popping out, please reach out to our customer service team and we can troubleshoot the issue with you and see if we can figure out what is happening. They can be contacted through Live Chat on our website (lifetime.com) Monday-Friday, or over the phone Mondays, Tuesdays, and Thursdays at (800) 225-3865. They can also be reached by email at customercare@lifetime.com. Customer Service hours are from 7:00 am to 5:00 pm (MT). *DC