Copy and pasting bitcoin address in the clipboard isn't going to lead you to this mistake not unless your computer is infected with that malware that is changing copied bitcoin address to the hackers wallet address. But if the computer is healthy, this is rarely happening.
When you copy/paste you can cross-check a couple of chars at start, in the middle and at the end. It's a good strategy to stay on the safe side, just in case.
The way you said "Bitcoin Core" (BTC) instantly made it obvious that this was/is a copy paste from the Bitcoin Cash shillmasters..
And you just advertised their website.
