I don't think your issue is someone voting for you on another server. You've mentioned that voting works for you on this one certain laptop, right? Someone else voting for you is not the problem. Does it work if you try voting on your phone?
Hi, Valixta! Okay, reasons this may be happening to you. #1 Someone is voting for you #2 you are voting on a different server #3 there is a technical issue and you need to make contact with [email protected]
Have you tried voting from a different IP? I can't think of anything else causing this issue, sorry. :/