good evening: just curious if anyone else has an eco 20 from brinsea, and if they've noticed air pockets with different temperatures inside the incubator. if i put my spot on therm. on top of the eggs, it read 100.1. however, if i lower toward the bottom of the egg, it will go all the way down to 98.2. the incubator has a fan. is this typical? unusual? anyone have experience?