In 52 Card Solitaire, sometimes the card I pick up will be at a lower layer than a card I just put down. I can get this to happen fairly reliably if I pick up a card, right-click to send it back, and pick up another card quickly. The card I'm holding now will slide under the card that was sent back. This sometimes also happens when stacking cards, not just send-back.
52 seems to have a very low win rate. More than half of the time, I get into a situation where there's no room to move off a card that's blocking everything else. And I'm pretty sure there isn't something I could have done differently; there's very little freedom in most of the random deals.
Is the 2-star rating supposed to be "how easy it is to play" or "how easy it is to win"? I think 52 is easy to play, but hard to win.