Common mistakes when playing with a short stack in PLO tournaments include being too passive, waiting too long to make a move, and playing speculative hands that lack strong equity. Failing to recognize good push-fold spots can lead to being blinded out, while taking unnecessary risks with weak holdings can result in early elimination. Many players also miscalculate fold equity, either shoving into opponents unlikely to fold or missing opportunities where aggression could force better hands to fold. Poor stack preservation, such as committing chips without a clear plan, further reduces the chances of making a comeback. Effective short-stack play requires discipline, well-timed aggression, and a strong understanding of equity.