Don't have Naked 3 but my Naked 2 palette had this issue, and this week about half of the pans actually fell out!! Luckily not far just inside of my makeup train case I use to store my stuff... nothing broke . When they are out you can see they are only held in by a blob of glue, which is why some may look uneven? Glued off centre or not pressed down into the pan with even pressure before they dry.
I used a hot glue gun to put my pans back in and made sure to press down slowly and evenly so they would sit nicely, it seems pretty secure now!