MT4 Alpari (US) old sl problem

I have used an ECN but I thought that maybe it will be just easier to use MT4 for orders, I had a few incidents where my position was closed due to old sl price (by old I mean for other orders which were closed out on the same pair), I day traded using the platform…

is it just my luck or what!?!?!

does it happen with MT4 typically or is it the brokers fault???

what do you guys think, did it happen to anyone else?