A stop order executes a market order once the stop price is reached. Stop orders will revert back to a market order (based on market prices) and the amount fulfilled may be considerably different from the stop price entered.
Sample: If you placed a sell stop order for ETH at PHP 50,000 (while having a current market price of PHP 100,000), your stop order will be executed as a market order as soon as it triggers your stop price of PHP 50,000.