A Limit Order is to buy or sell a specific quantity at a specified price. it will be traded when the specified price or quantity reaches the market demand.
However, when the market's liquidity is low and the transaction price changes drastically, the limit order is not guaranteed to be traded. It is relatively safe and will not be traded at unexpected prices.
A Market order is to sell and trade immediately at the current market price.
Market orders are not guaranteed to be traded at your expected price. Market orders may complete matching transactions through several different prices.
For the matching transaction, the current number of trades in the market price order and pending order depth will prevail.
Also, because the sale of market orders is almost certain to be traded, the strike price might be different from the original one which might cause risk of slippage.