according to the screenshot, you open a position not for $300, as required by the OP, but for $180. And accordingly, for this reason, the liquidation price will have a different meaning.
No, it does not have any different changes because if the amount you use to open the position. If you open a position with $50, $100 or any amount of money, the liquidation price will still be the same as long s you open it at the same price and using the same leverage.