Triggering of SELL STOP Order during widened spread

Hi,

I have an EA which places a SELL STOP order together with a SL at a distance of x points  above the trigger price.

Now the bid price of the traded symbol (e.g. USDJPY) reaches the trigger price of the pending order (from above) but the spread is more than x points. Nevertheless I observe that the order will be triggered and I get a sell position with a SL below the ask price of the symbol!

This position exists until the next tick.

I saw this behaviour in the strategy tester.

Question: is this normal? It's all right?

Matthias