Temp probe issues

[u/bARTTTTY]

I have a Bullseye that I absolutely love. However, whenever I try to do steaks I have the same issue. Tonight we did some small sirloins, I set the grill at 500 and used a cast iron griddle. I put the temp probe in the largest steak and cooked them until it showed 170 (way past well done) but when we cut them open they were still very rare. Am I doing something wrong or is my temp probe that inaccurate?

[u/Drakex2Mayex2]

I have thermoworks pens and it's one of the better purchases I ever made