Just curious, you ARE working with an agent, correct? I certainly hope so because your agent will be able to protect your interests and make sure you don't pay for something you don't need to. I run across so many sellers these days that think they can sell their house themselves to "save money" only to find out that they are paying way more costs than they should and not getting the sales price they should. Even as a Realtor, I hired another Realtor in my office to list and sell my own home so she could take the liability and stress off my back.
Sit down with your Realtor and go over the contracts and the estimate and get a detailed explanation. If you're still not satisfied, arrange a meeting with your Realtor and their Broker and have it all explained. Selling a home costs money, but you should make sure you don't pay more than you need to.
Keller Williams Realty
Also, you will need to compare it with the Purchase agreement to see what you agreed to pay for.
If you have further questions, you can reach me at 951-312-8473. or contact a Real Estate Attorney