I have access to the account only from my IP. API-keys without the right to withdraw funds. If I had been hacked, they would have changed the API -keys. But this was not. Dropped by the old keys. With keys without the right of withdrawal, you can only sell coins.
If you do believe you aren't getting hacked, then somehow there is a problem within the BIttrex system which is highly unlikely. However, I'd still believe you are getting compromised. And judging by your screenshot even though it's hard to analyze since I don't know which is your true IP address. You are highly likely being hacked.
Anyway, try to move your thread to more proper section like
Beginners & help or
Exchanges, you probably will get more response there.