That’s because your home is valued in different ways, for different reasons, the following is often used to calculate market value of a home:
Interior layout & design preferences at the time
Location & proximity to various types of transit
Age
The interior size of a home
Garage, carports, decks, number of parking stall, RV parking, etc.
Upgrades and maintenance such as: renovations, hot water
tank/furnace/roof/windows updated, flooring, appliances, and more
Lot size if detached, and whether the lot is flat, sloped, difficult to build on, in a flood plain, or has large trees with roots located on the lot area
The CURRENT real estate market trends
Recent sales that are comparable
Buyer emotion and how badly they need to move or want THAT property