Tiger Brokers Help! Question: I am using Tiger Brokers to trade.

I have set a " stop order" to buy my stocks at a preferred price. However, when I check my positions, I noticed that the "cost" price is different (slightly higher). Please advice! I set my stop order at $52.53 but my cost price in my positions is $52.58!

Am I using the wrong order type and how do I purchase at the exact price? Thank you 🙂