This is not something that has to be "fixed".
It is a security system, implemented to keep cheaters out of the event. Now you both got some explaining to do, or I'll consider that the system is working well.
The computer you used to register in the server is 'A'. You then connected to the server with computer 'B'.
Why?
Do you have more than one account registered in Vicewar?
Did you share your key with someone else?
Have you been changing your UID2 to ban evade in some other server?
Do you have more than one PC with which you play VCMP?
The computer you used to register in the server is 'A'. You then connected to the server with computer 'B'.
Why?
Answer: I only have 1 PC so probably it isn't possible.
Do you have more than one account registered in Vicewar?
Answer: No, I only registered 1 account in Vicewar.
Did you share your key with someone else?
Answer: No, I haven't shared my key with anyone else.
Have you been changing your UID2 to ban evade in some other server?
Answer: I am not banned in any server so I don't need to change my UID2 to ban evade in any of server.
Do you have more than one PC with which you play VCMP?
Answer: No, I only have 1 PC with which I play VCMP.