Problems with uploading over avrdude in Atmel Studio 7

Hello All

I am new on programming Arduino and work at the moment with a brand new Arduino Beetle Leonardo from DFRobot with the ATMega32U4 on it.
I have average knowledge on c-programming and the board runs with Arduino IDE with some sample programs without problems.

At the moment i stuck on some point:
If i want to use the Atmel Studio 7 and configure the "External Tool" with the specific Command and Arguments, or i want to use the avrdude over command line,
i have problems to program the device. The
The thing what makes me confuse is, that the Arduino Leonardo is recognize at COM-Port Nr.5 and also the Serial Monitor works on this COM-Port Nr.5.
But as you can see in the beginning of the verbose output of the Arduino IDE while programming, it changes somehow to Com-Port Nr. 6.
I can not find any information about that, and also nothing about this syntaxes "PORTS {COM5, } / {} => {}" and "PORTS {} / {COM6, } => {COM6, }".