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Assumimg, bitcoin is at $50500, you set the STOP at $50100, and the price at $50000. That means if the price of bitcoin drop from $50500 to $50100 or below but yet above the price you set ($50000), the order will be filled and the coin will be sold at $50000. But, in this case, it ought to be like this.
Stop price= $50100
Price = $50000
But, very possible some exchanges set it the way you inputted it here, it will be good if you represent it the way the exchange you are using do.
If this is the case, not all exchanges support this type of order. They are most commonly available in leverage markets.
That is how stop loss should look like, but it may differ the way it is from an exchange to another but all the same.