...If you are using estimated power, you haven't put your weight in correctly.
...or there was a tailwind, or a headwind, or your mates are pulling hard on the front, or the road surface is heavy, or surface is light, or water bottles are both full, or your water bottles are both...
...or there was a tailwind, or a headwind, or your mates are pulling hard on the front, or the road surface is heavy, or surface is light, or water bottles are both full, or your water bottles are both...
...but yeah.