S/L for new order

I am new in forex, and am paper trading with MT now.

I placed a buy order of EUR/USD pair with stop loss of 1.40268, after the order was executed at 1.40992, moments later, I was surprised to learn that this open order was stopped out at 1.40951.

10309517 2010.01.21 05:18 buy 3.00 eurusd 1.40992 1.40268 0.00000 2010.01.21 05:40 1.40951 0.00 0.00 0.00 -123.00

Why was the stop order filled above my S/L price? It was supposed to be closed only after the price is fall below my S/L.

Thanks for any clarification obout this

Is it possible that you used more leverage to enter this trade than you should have? You could have been stopped out by a margin call.

That's a good point. ?But It didn't look like the margin call, b'cos the account total balance was $4320 (open orders included).

I'd research margin calls again and be sure that you have calculated everything correctly.

Also, if I may interject some caution...please protect your money above all costs - worry about risk more than reward and your skills at trading will make the reward play out. I would highly encourage you never to use all of your leverage unless you have predetermined risk ahead of time and decided that you have a low risk opportunity which allows you the ability to use leverage.

Thanks for the advice Moody, this brought up the thought of how to limit my trading exposure ( not all out), that is, not using up all the trading fund. I need to study more about margin requirment to prevent big hit in case of high leverage.

Good thing that you remind me.