[TheAvengers2]

Each character of the "cappers" string is a player index. Perhaps there's only one person capping? If that's the case, then Buffer[1] is likely a null byte. Try to do Buffer[0] instead.

Or perhaps it's storing the ascii character for the client index? If that's the case, then most client indexes wouldn't be printable. You'll need to use %d to print it as a number instead.