Is your SL order in a system safe?

#1
Today I fed SL order for Sell Gold Mini (as trailing SL)

The order was for 2 lots and the price fell down to hit my TSL

My order was partially executed means one lot was sold at TSL hit
and other was left pending?

If suitable price is not met your SL order is of no use

Is your SL order in a system safe?
:(