I can think of two things that may have happened:
1. The website you visited wasn't Binance.
2. You have a bitcoin address clipboard malware that changes the address that you have in your clipboard to the hacker's address.
Did you double check the address you pasted before sending the coins?
Can you run a malware scan to see if your computer is infected?
Can you check your browser history to see if you clicked in any fake Binance website?
This things you should consider before proceeding your transaction, there are some instances that you click wrong site instead of legit site you click is phishing site. Hope you will learn for your mistakes and will not happen again make extra careful of handling our fund also always double or multiple check the address which we are copied and paste.