SL triggered without reaching the Price is it possible?

General
1

I have Place a Buy Limit Order and it was executed @ 3208 , also i placed a SL - M order @ 3198 @ 18:03:50 my SL order got executed and by that time the low was 3199 only. Is this possible ?

2

Check this answer: http://tradingqna.com/2492/placed-order-which-executed-price-charts-amibroker-other-chart