If you run AnTuTu twice or more, there are always different results. I had results between 155000 and 110000 without any changes at the same day. It´s also different with different themes, especially, if they are animated.
While running the benchmark my phone layed on a very cold stone plate, so the CPU doesn't overheat or electrons get slower because of higher temperatures and physical causes.
Additionally I added Antutu to the game booster for full resources only for Antutu^^