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My steems got transferred too. it looks like a pishing thing. I recommend not to keep steems lying in your active account. it is best to transfer or power it up. Recover your account/change password.

I tried to contact that person on instagram and facebook. NO replies :(

I do not know why I lost money, someone got into my nest.

It was the same for me. Can you try contacting that person with the following links;
link1: FB
link2: Insta

lets hope the person replies.

can not input, because the page does not exist.
Once the person has taken it, they will never return it

We should collaborate​ and call this person out on the platform so people understand and be aware.

that person seems to have hacked my ních. I lost 60steem, sadly.

I have lost 40 also. I am not sure what else I could do. I set up an account recovery and changed my password.

A sad story, I will write a post for people to note.