I just opened my newly graded T206 cards and I noticed that two of the cards appeared to be loose and tilted inside the holder and as I moved them around slightly to correct the problem, one of them got stuck on the side of the placeholder and another started moving diagonally out of the placeholder! I had to tap, tap, tap, the holder many times to get the card back firmly in the placeholder and centered correctly.
One of the cards got dinged in a corner as the card ran up the side of the holder. Horrible.