My first mixing experience was with https://tumbler.io and they asked me to save my mixing code which I did, and the mixing process was very fine and successful. Though because of the mixing fee I chose, the transaction took about 7 hours but finally, I received alert of the coins. And from your story even at the first clause, you did not tell what really happened, you are hiding somethings and from my understanding, you are using alt-account and that cause part of your hiding story because you don't want to identify your real self. This is not a matter you use an alt-account for. You said you have not done it in any other platform, then you would have narrate everything happened so people would have called the attention of Yo!Mix here to verify but here, it is an allegation without prove that Yo!Mix was the one. That screenshot might be a transaction you had done at somewhere else.