Whonix Gateway and two Windows Machines

Hi,

Iam using Whonix Gateway in Virtualbox. The main machine has Linux Debian. Now I routed all traffic from a Windows 7 machine through Whonix which works fine.
But when I start the clone machine at the same time I cannot route both through the Whonix Gateway silmutaniously! I can only route the first I start through Whonix Gateway. It doesnt matter if its the original one or the clone. I alreade change the Mac Adress. The clone is a full clone no dependat clone.

Can anyone help me why the second Windows I start cannot got through the Whonix Gateway at the same time like the other?

Thanks!

Additional workstations need a different IP. Documented here, please have a look: