That's it guys, thank you for reading.
You should look up clipboard hijacking, and check your laptop for malware/virus.
Hackers have made special tools that detect BTC addresses when copied to clipboards and replace it with their own.
In the future double-check the address before you actually send the payment.
checkout
https://sendbit.io they prevent clipboard hijacking and even give you private keys for each address you own.
Sorry for your loss buddy.
It is really sad and frustrating when you are relying about copy pasting from the site itself knowing that you are safer but in the end?you will end up being a victim of this hackers.
I Suggest also to OP that make a Copy of His wallet address in other form or even in His Bitcointalk account so whenever he need to copy and pasting at least he has a basis of double checking to find if the one is true or changed by hackers and looking the comparison of those addresses?it is very obvious that they are different so i don't know why Op did not noticed that in the first place.