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Hmm, public computer?

Nope!

I have no idea.

Contact blocktrades support and ask them to give you the transaction details.
Maybe you input the wrong address?

But I didn't withdrawal this money! Somebody did from my account.

And how to contact them?

Support @ blocktrades.us
Include the memo and date and time in your email.

Have you changed your keys?
You need your owner key and do it in settings.

Oh yes I have done this already. I just wrote an e-mail to them... We will se what is gonna happened.