Okay. Here are a couple of reasons for erroneous stair counting: The Tracker counts floors by the variation in air pressure when climbing a flight of stairs. The drop in pressure is minute for a flight of stairs. So if you are walking while a low pressure system is moving in, the variation in air pressure can cause the Tracker to record "unearned " flights, occasionally a lot of them! Sometimes someone opening and closing the door rapidly in a well sealed house can cause a change in air pressure. So if the air pressure dropped sharply while working out on an elliptical--you could pick up some floors.
You can also get some impressive floor readings if you are moving around in a rising elevator.
I tend to use the floor count (in other words, a ten foot rise in elevation for each floor ascended) when determining approximate elevation rise when hiking. When I get an abnormal floor count, it is usually because a storm has come in. Some people have reported being in a windstorm will also affect the readings.
I hope this helps answer the question.
