So let me unedrstand the situation right.

The mixer is supposed to work as follows:
1- You create a mixing session, send the coins, and click the "mix my coins" button.
2- Once you click the button, the funds on that address are moved (it's supposed to be that way), and you see a new screen with a random number of addresses, between 2 and 5 IIRC.
3- You have the private key to those addresses, and a random percentage of the funds is sent to each address at a random time; and you only have to sweep the in Electrum or any other wallet software.

Now; where exactly did the proccess not work for you?  I believe it's crucial to understand that to know whether the mistake was on your end on on the mixers' end.