Hey guys few days ago i send some xvg to my friend around 5kxvg he received them but yesterday i was checking block explorer on the verge website and i just saw that at the exactly same time there were send another 13.864, 51 to another adress i dunno? How can that happen? A Virus or something?
i guess you probably used one (or more) unspent outputs totalling 14364 XVG as input, and created 2 outputs: 1 output of 500 XVG to the receiver, and an output of 13864 XVG to your change address.
Does your wallet shows your old balance - 500 XVG, or your old balance - 14364?
In the first case (old balance - 500 XVG) above guess is probably correct.
In the last case (balance - 14364), double check if your wallet is completely synced. If so, something else might be going on.