It is probably because you are looking at limited information on some website. (Maybe this one!) What you need is a good, experienced Realtor. Then if you are pre-qualified, and ready to buy a house, your Agent can show you any property which is on the market for sale.
The problem is you may be seeing info about a property which is misleading. Some offices post that kind of information on various web pages. They are just trying to make you call them, so we'll put that in the advertising category, and note that it is legal. --But not helpful.
What you need is a good Realtor to assist you in the effort to reach your goals. Forget all the crazy ads on the internet. Even if you don't plan to buy a house right away, and you just want some info to drool over, call an Agent and explain what you want. They will then help you get the facts. When you are ready to buy, then they will help you make an offer. It's that simple.
A Realtor's services are worth their weight in gold. Very often, there is no fee up front. You can get all your questions answered, and a lot more, too. When you buy a house, you want a professional to represent you. Don't worry about their fees; a buyer's agent gets paid a commission by the seller's broker at closing. Just focus on how an agent can help you, and ask for all the information that you need!
Have a good day!
ULTRA Real Estate Services