Life lesson learned: calibrate your oven. Who cares what the dial says on top? Who cares if it's gas or electric? Your oven may be lying to you.
I just recently moved. I am very excited about my new house; it has lots of "potential" if you know what I mean.
My last oven was 110-degrees hotter than the dial said. My new oven is 75-degrees colder. Therefore, there is a permanent resident to the inside of my oven: a trusty thermometer. He stands there like a watchdog, warning me when my shady oven is being less than honest.