Question regarding Futures trading

Hey fellow merchants alike! Only a quick query relating to a factor that occurred to me.

I was trading eth/usdt on usd-m.

The worth of eth was 2940$

I needed to brief as soon as the worth reaches 2929$

The contract was set on restrict, as i assumed meaning it is going to only go in as soon as it reaches the worth i set.

Abruptly as i hit brief it put me in at current market worth!!

Now my query is this : did it put my contract in at current worth because the system advised itself it will be a greater choice? Shhould i've used the "trailing stop" choice insted for what i needed to do?

Thanks prematurely for the help :)!!