Are you actually clicking the piece and then clicking the destination square and seeing that problem? Are you using a mouse?
missclicks
1) clicking the piece and then destination. Using mouse with no other problems.
2) problem only with chess.com

Ok, so not using a trouchpad?
Do you have premove on? I've had the problem before where I had a legitimate misclick and ended up also hitting the square I intended which got read as a premove.
Ended up with two mistaken moves out of the opening.
I'm having lots of missclicks (pieces moving to unwanted squares). I use Mac, and have problems with Firefox and Safari. Help please