These errors are not uncommon and can be caused by several different factors. The tax record shows 3 bedroom, 2.1 bath. Property details like flagstone, windows, shelters, etc.. would have to be put in manually by a listing agent. Tax shows 4,166 sqft, which is what your taxes are based on. If improvements/additions have been made, they've not been reported to the tax appraisers office. If you need help in determining the market value, and/or listing your property, please contact me. Tax record attached.
Coldwell Banker - Flower Mound