Simple tokens error?

Hello guys, I've gotten myself into some problems that I cant figure myself out from..

Here is the problem:

Recently I've invested in the Simple Token ICO (OST), I did this by sending 1 ether to Simpletoken.org from Myetherwallet.com (MEW) and signing up for the ICO.
By doing so I would receive about 5k OST to my MEW.
They distrubited the token on 19 December, and they got sent to my MEW account.
But the same time they got sent to another account from my account, now I dont know if this is an error, something I did, or if I've got hacked.
But the other account they got sent to has never logged on, has only recived one transaction before(mine). And this issue is about 20 days old..

Most people would say I got hacked but I take good care of my computer and my codes, I have the latest VPN/Malware/Keylogger security, I am sure not the get phised or something like that.
Noone has access to my codes by any other means.

I THINK; I've sent them somewhere crazy, I've made many transactions since this happend.

Now does anyone know what the problem is?

All answers and helpfull tips are welcome
And to make it more intressting I've put up a bounty to anyone that helps me solve this, I'll send you 100 simple tokens when the problem is solved! =)

Thanks in advance!