Rapid Change in Steak Temperature During Cook

Has this ever happened to you guys and girls, you check a beef fillet and the Thermapen reads around 101 and after 2-1/2 more minutes of cooking the temperature reads 130.  This was on a 2" thick 10 ounce fillet that had been set out for several hours prior to cooking, and cooked at around 500 degrees.  The same thing happened with my ribeye, but I cooked it way less as it was much thinner and I was shooting for more of a rare center.  The fillet ended up being a nice pink, but I had planned to pull it at 125 as the wife likes here a little more cooked than medium rare.