These are the original vanity address and its private key.
Address: 1BTCyxPdP9iBgxj4FPs3KhQ8AB8rN9o1AH
Private Key: 5KY7At1DUPWtmARxaB53L5eU7QVNAaH5jzb6mZiaCCha12hN6U5
How is it possible bitaddress.org shows another BTC address?
Sorry, everything is clear now. Everybody should be very carefull. The addresses above were actually generated not by bitaddress.org, but by biladdress.org ("l" instead of "t"). I do not know how did I go there... probably some fake link :-(
Now i tested this private key on real bitaddress.org - everything is ok. Shows BTC address: 1BTCyxPdP9iBgxj4FPs3KhQ8AB8rN9o1AH