Liquidation price
The liquidation price is the price at which the exchange force-closes a leveraged position, because its losses have used up the margin. It must always sit beyond your stop loss, never between your entry and your stop.
On isolated margin, the liquidation price sits roughly 1 / leverage away from the entry: a long at 80,000 with 20x leverage is liquidated near 76,000 (80,000 × (1 − 1/20)); at 50x, near 78,400. The exchange keeps a small maintenance margin, so the real liquidation price is slightly closer to the entry than this estimate. Every exchange shows it when you open the position.
The rule: for a long, the liquidation price must sit below your stop; for a short, above it. If it sits between your entry and your stop, the exchange closes the trade before your stop can, so lower the leverage until it moves beyond the stop.
Learn more: what is leverage?, what margin is and how to avoid liquidation.