I'm wondering how you were able to send about 30,000-40,000 USD to a site that I had never dealt with before or had the necessary trust? It's weird !!!
~snip~
It is really strange for anyone who behaves rationally and has earned such money in any
"honest" way to simply go and do such a sensitive operation without any prior checking. However, without any evidence, maybe the OP is just a victim of clipboard malware and the mixer sent coins, but to the wrong address.